Each turn a player may move up to their speed, use 1 action, 1 reaction, and sometimes 1 bonus action.
Casting a spell generally costs an action. Cantrips still take an action to cast (unless otherwise specified).
If you use your bonus action to cast a spell instead of your action because a class ability or the spell's description says you can, you can then use your action to cast a cantrip.
And in your reaction? Can you still cast a spell? Knowing that is not possible to do bonus action spell + action spell;
but you can cast a bonus action spell + action cantrip spell + reaction spell
remember the only limitations are the actions you have, if you have 2 actions a turn you can cast any 2 spells that turn (multiclass fighter action surge feature allows this), and if you cast a bonus action spell then you can only cast a cantrip afterward
because you usually have only 1 action a turn you can only cast 1 spell a turn... if you cast a bonus action spell then you can also cast a cantrip that same turn... reactions can be cast when they are triggered (shield, feather fall, counterspell etc.)
Each turn a player may move up to their speed, use 1 action, 1 reaction, and sometimes 1 bonus action.
Casting a spell generally costs an action. Cantrips still take an action to cast (unless otherwise specified).
If you use your bonus action to cast a spell instead of your action because a class ability or the spell's description says you can, you can then use your action to cast a cantrip.
And in your reaction? Can you still cast a spell? Knowing that is not possible to do bonus action spell + action spell;
Spells cast with a casting time of 1 Reaction are irrelevant to the bonus action spellcasting rule. The only interaction is with your action & bonus action, and it breaks down into one simple truism:
If you have cast, or intend to cast, any spell with a bonus action, the only type of spell that you may cast with your action is a cantrip with a casting time of 1action.
This is true for every type of spellcaster, and holds true for every alteration to spellcasting such as Metamagic or Action Surge.
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You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
His first comment and quote only applies to bonus actions... you cannot cast a spell as an action and then cast a cantrip.
Also, he is right that you can cast a reaction spell during your own turn, but it does not have to be a cantrip.
Once you cast a bonus action spell, such as spiritual weapon, then on future turns you can use your bonus action to control the weapon to make an attack or cast a bonus action spell, not both. As you only get 1 bonus action a turn you have to decide whether to use it to make a bonus action attack or cast a bonus action spell.
And his example about the fireball is correct, you can cast a 3rd level Counterspell on your turn to stop the other Counterspell... even though he suggested earlier in his post that any reaction cast on your turn had to be a cantrip.
Some of the rules surrounding spellcasting can be confusing but try to remember:
Action: you usually only have 1 per turn and therefore will only be able to cast 1 spell a turn.
Bonus action: also, you potentially only have 1 of these a turn, if you use it to cast a bonus action spell, and you have your action available you can also cast a 2nd spell that turn so long as it is a cantrip with the casting time of 1 action.
Reaction: You only get 1 of these a round (not turn) and can use it to cast a reaction spell (if the conditions of the reaction spell are met) at any time on any turn.
A reaction spell could be used on your turn and be stymied by the Bonus Action Spell cast rule. You cast Healing Word, a Bonus Action spell. An enemy Counterspells it. It is still technically your turn but, you can't Counterspell his Counterspell. Why?
You can't cast another spell during the same turn,except for a cantrip with a casting time of 1 action.
A spell cast as a Reaction falls into trying to cast another spell during the same turn, it does not count as a cantrip with a casting time of 1 action.
His first comment and quote only applies to bonus actions... you cannot cast a spell as an action and then cast a cantrip.
Also, he is right that you can cast a reaction spell during your own turn, but it does not have to be a cantrip.
Once you cast a bonus action spell, such as spiritual weapon, then on future turns you can use your bonus action to control the weapon to make an attack or cast a bonus action spell, not both. As you only get 1 bonus action a turn you have to decide whether to use it to make a bonus action attack or cast a bonus action spell.
And his example about the fireball is correct, you can cast a 3rd level Counterspell on your turn to stop the other Counterspell... even though he suggested earlier in his post that any reaction cast on your turn had to be a cantrip.
Some of the rules surrounding spellcasting can be confusing but try to remember:
Action: you usually only have 1 per turn and therefore will only be able to cast 1 spell a turn.
Bonus action: also, you potentially only have 1 of these a turn, if you use it to cast a bonus action spell, and you have your action available you can also cast a 2nd spell that turn so long as it is a cantrip with the casting time of 1 action.
Reaction: You only get 1 of these a round (not turn) and can use it to cast a reaction spell (if the conditions of the reaction spell are met) at any time on any turn.
Your rule on Reactions is incorrect...if you cast a bonus action, you cannot cast a reaction on the same turn (other turns in the round are ok). The rule for bonus action says you cannot cast another spell on your turn, except for a cantrip with a casting time of one action. That means reactions are out (not an action to cast) and leveled spells are out (not cantrips). But as soon as your turn ends, reactions can be cast again (provided you don't use it on something else)
Your rule on Reactions is incorrect...if you cast a bonus action, you cannot cast a reaction on the same turn (other turns in the round are ok).
I don't see why not if you use your reaction to cast a cantrip.
The rule for bonus action says you cannot cast another spell on your turn, except for a cantrip with a casting time of one action.
So far so good.
That means reactions are out (not an action to cast) and leveled spells are out (not cantrips).
It's this sentence that I don't understand. Why would reactions be out, they don't take an action and you can have other reactions than those coming from a readied action.
But as soon as your turn ends, reactions can be cast again (provided you don't use it on something else)
And that is of course fine.
The way the bonus action rule is worded ("You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action"), the only spells that can be cast on your turn must meet both requirements (cantrip, casting time of one action). Reaction spells use your reaction, not an action, so they don't meet the second requirement, and with no official reaction cantrips, any reaction spell would also not meet the first requirement either.
They have established a rule (you can't cast another spell during the same turn) and an exception (except for a cantrip with a casting time of 1 action). since the rule excludes all other spells that turn, and reaction spells don't meet either criteria for the exception (and wouldn't meet the second even in homebrew), they are not able to be cast until your turn is over.
If they wanted to allow reactions on the same turn, the bonus action rule would have to either modify the rule ("you can't cast a spell using your action during the same turn...", for example) or modify the exception ("except reaction spells or a cantrip with a casting time of one action", for example).
Seriously, why are we saying you can't cast a reaction spell if you've used a bonus action spell? Reactions are completely divorced from action/bonus action... The BA Spellcasting rule does not say you can/can't cast a spell as a reaction because it doesn't need to; the interaction is specifically between action/bonus action, and spells with a casting time of 1 reaction are defined separately.
Besides, if it were true, that would be analogous to saying any caster using a bonus action to cast a spell (which is, y'know, basically everyone) is unable to counter-Counterspell. That's a pretty ******* important interaction to not directly address, and while it may be a niche interaction, it's incredibly commonplace in actual practice. A less niche, yet also highly common interaction, would be Shield and opportunity attacks. If a caster has used a bonus action to cast any spell, and something they do provokes an OA from an enemy, are we really saying they are unable to cast Shield as a reaction to that? That a caster can't cast Feather Fall when applicable?
I would very much expect the BA spellcasting rule to say "You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action, and you cannot cast any spell as a reaction on that turn", or for the Reaction spellcasting rule to say "If a spell can be cast as a reaction, the spell description tells you exactly when you can do so, but cannot be cast on the same turn if you have already cast a spell with a bonus action."
Alternatively, if you haven't done anything with your action/bonus action yet? What happens when you start your turn by moving, provoking an OA, and casting Shield as a reaction? You're then completely barred from casting any spell as a bonus action for the remainder of your turn? That doesn't pass the sniff-test. There's no way in hell such a complicated set of interactions is RAW or RAI without the rule being written in far more detail than it is.
You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
For what it's worth, the Sage Advice Compendium has addressed this specific situation. Stipulated:
Official Rulings
Official rulings on how to interpret rules are made here in the Sage Advice Compendium. The public statements of the D&D team, or anyone else at Wizards of the Coast, are not official rulings; they are advice. The tweets of Jeremy Crawford (@JeremyECrawford), the game’s principal rules designer, are sometimes a preview of rulings that will appear here. A Dungeon Master adjudicates the game and determines whether to use an official ruling in play. The DM always has the final say on rules questions.
So here's what the document has to say:
Can you cast a reaction spell on your turn? You sure can! Here’s a common way for it to happen: Cornelius the wizard is casting fireball on his turn, and his foe casts counterspell on him. Cornelius also has counterspell prepared, so he uses his reaction to cast it and break his foe’s counterspell before it can stop fireball.
So: Original RAW, nope. RAW revised by SA Compendium, yup. RAI, yup. DM's call in the end? Yup.
The rule says "during the same turn" and that is pretty plain english without any need for clarification. the only exception given is the cantrip/one action option. Other turns during a round are not your turn, so shield would be valid 99% of the time (the 1% being the improbable moments you need it on your turn), including during every other turn that round.
You may think its a bad rule, but the RAW is about as plain as it can be. A turn in which you cast a bonus action spell is a turn in which you cannot cast any other spell, unless it meets the specific requirements of the exception, which reaction spells don't.
For what it's worth, the Sage Advice Compendium has addressed this specific situation. Stipulated:
Official Rulings
Official rulings on how to interpret rules are made here in the Sage Advice Compendium. The public statements of the D&D team, or anyone else at Wizards of the Coast, are not official rulings; they are advice. The tweets of Jeremy Crawford (@JeremyECrawford), the game’s principal rules designer, are sometimes a preview of rulings that will appear here. A Dungeon Master adjudicates the game and determines whether to use an official ruling in play. The DM always has the final say on rules questions.
So here's what the document has to say:
Can you cast a reaction spell on your turn? You sure can! Here’s a common way for it to happen: Cornelius the wizard is casting fireball on his turn, and his foe casts counterspell on him. Cornelius also has counterspell prepared, so he uses his reaction to cast it and break his foe’s counterspell before it can stop fireball.
So: Original RAW, nope. RAW revised by SA Compendium, yup. RAI, yup. DM's call in the end? Yup.
That addresses the question "can I cast a reaction spell on my turn?" not the question "can I cast a reaction spell on my turn when I have cast (or plan to cast) a bonus action spell?". I'm answering the second question
I misunderstood. It explains that you can cast a reaction spell when you've just cast a spell with your action, not your bonus action. Thanks for the clarification.
I'm not that bright, so maybe that's what's holding me back here, but I struggle to find the benefit of ruling that way.
The rule says "during the same turn" and that is pretty plain english without any need for clarification. the only exception given is the cantrip/one action option. Other turns during a round are not your turn, so shield would be valid 99% of the time (the 1% being the improbable moments you need it on your turn), including during every other turn that round.
You may think its a bad rule, but the RAW is about as plain as it can be. A turn in which you cast a bonus action spell is a turn in which you cannot cast any other spell, unless it meets the specific requirements of the exception, which reaction spells don't.
Except the problem is that what you're saying equates to "If you cast a spell as a reaction on your turn, you are unable to cast any spell as a bonus action", and that is simply far too removed from any written or intended interactions to be a valid interpretation.
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You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
The rule says "during the same turn" and that is pretty plain english without any need for clarification. the only exception given is the cantrip/one action option. Other turns during a round are not your turn, so shield would be valid 99% of the time (the 1% being the improbable moments you need it on your turn), including during every other turn that round.
You may think its a bad rule, but the RAW is about as plain as it can be. A turn in which you cast a bonus action spell is a turn in which you cannot cast any other spell, unless it meets the specific requirements of the exception, which reaction spells don't.
Except the problem is that what you're saying equates to "If you cast a spell as a reaction on your turn, you are unable to cast any spell as a bonus action", and that is simply far too removed from any written or intended interactions to be a valid interpretation.
Why is it that far removed though? its the same as if I cast a leveled action spell on my turn...
If I cast Fireball on my turn , I can't cast Misty Step later
If I cast Shield on my turn, I can't cast Misty Step later
Its not any harder. Again, I'm not saying its a well written rule, but as written, in plain language, both of the above statements are true because the rule says "during the same turn" regardless of action/reaction/etc
It's not that complicated, once you trust that the rule says what it means instead of what you want.
Normal rule: like any other activity on your turn, you can cast spells with the action type that they tell or a feature you to use: action spells with an Action, bonus action spells with a Bonus Action, or reaction spells with a Reaction.
Exception: if you cast a spell using a bonus action, "You can't cast another spell during the same turn," except (1) a cantrip that (2) takes an action to cast.
Bonus + Action? Fine, but only if the Action is a cantrip.
Bonus + Action + Action (using Action Surge)? Debatable, but probably not. "cantrips with a casting time of 1 action" would have been more natural language to use if it was intended to be permissive for multiple action cantrips.
Bonus + Reaction? No, because a reaction spell is not "a cantrip with a casting time of 1 action."
Bonus + Action + Reaction? No reaction, see above.
The way the bonus action rule is worded ("You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action"), the only spells that can be cast on your turn must meet both requirements (cantrip, casting time of one action). Reaction spells use your reaction, not an action, so they don't meet the second requirement, and with no official reaction cantrips, any reaction spell would also not meet the first requirement either.
I'm sorry but you are dead wrong here. If we follow your logic, you could not cast any spell with a casting time of one action during a reaction, and is patently false. You can ready a spell with a casting time of one action, and cast it as a reaction when the trigger occur. RAW: "When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have a casting time of 1 action, and holding onto the spell's magic requires concentration (explained in chapter 10). "
There is no exclusion for a cantrip. So having a casting time of one action does not invalidate its casting during a reaction, even if it's a cantrip.
So I could cast a spell with a bonus action, and use my action to ready a cantrip to be cast on my reaction, within my turn or later.
They have established a rule (you can't cast another spell during the same turn) and an exception (except for a cantrip with a casting time of 1 action). since the rule excludes all other spells that turn, and reaction spells don't meet either criteria for the exception (and wouldn't meet the second even in homebrew), they are not able to be cast until your turn is over.
Except they do, like any other spell with a casting time of one action, they can be cast during a reaction. Reactions are not limited to "actions" labelled as reaction, see above.
We are talking about two different things. Readying a spell is an action, in which you cast the spell and hold the energy. A Reaction spell is a spell that has a casting time of one reaction.
The bonus action rule says you cannot cast another spell on your turn except for a cantrip with a casting time of one action. Whether you cast or ready that cantrip that would be allowed. But that is entirely different from a reaction spell like shield where the casting time is actually "one reaction"
You usually cannot release a readied spell as a reaction on your turn (technically you can, but the sequence of events to have a trigger release on the same turn you set it is highly improbable), and you lose the ready at the start of your next turn, so you can't hold a readied spell into your next turn.
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Each turn a player may move up to their speed, use 1 action, 1 reaction, and sometimes 1 bonus action.
Casting a spell generally costs an action. Cantrips still take an action to cast (unless otherwise specified).
If you use your bonus action to cast a spell instead of your action because a class ability or the spell's description says you can, you can then use your action to cast a cantrip.
And in your reaction? Can you still cast a spell?
Knowing that is not possible to do bonus action spell + action spell;
Are this combos possible:
bonus action spell + action cantrip
action spell + bonus action cantrip
Action spell + reaction spell
action spell + bonus action cantrip + reaction spell
bonus action spell + action cantrip = yes
action spell + bonus action cantrip = no
action spell + reaction spell = yes
action spell + bonus action cantrip + reaction spell = no
but you can cast a bonus action spell + action cantrip spell + reaction spell
remember the only limitations are the actions you have, if you have 2 actions a turn you can cast any 2 spells that turn (multiclass fighter action surge feature allows this), and if you cast a bonus action spell then you can only cast a cantrip afterward
because you usually have only 1 action a turn you can only cast 1 spell a turn... if you cast a bonus action spell then you can also cast a cantrip that same turn... reactions can be cast when they are triggered (shield, feather fall, counterspell etc.)
hope this helped?
ok and how about action spell + reaction spell??
Sorry answered ... :)
Spells cast with a casting time of 1 Reaction are irrelevant to the bonus action spellcasting rule. The only interaction is with your action & bonus action, and it breaks down into one simple truism:
This is true for every type of spellcaster, and holds true for every alteration to spellcasting such as Metamagic or Action Surge.
You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
Lyxen's statements contain a few mistakes:
His first comment and quote only applies to bonus actions... you cannot cast a spell as an action and then cast a cantrip.
Also, he is right that you can cast a reaction spell during your own turn, but it does not have to be a cantrip.
Once you cast a bonus action spell, such as spiritual weapon, then on future turns you can use your bonus action to control the weapon to make an attack or cast a bonus action spell, not both. As you only get 1 bonus action a turn you have to decide whether to use it to make a bonus action attack or cast a bonus action spell.
And his example about the fireball is correct, you can cast a 3rd level Counterspell on your turn to stop the other Counterspell... even though he suggested earlier in his post that any reaction cast on your turn had to be a cantrip.
Some of the rules surrounding spellcasting can be confusing but try to remember:
Action: you usually only have 1 per turn and therefore will only be able to cast 1 spell a turn.
Bonus action: also, you potentially only have 1 of these a turn, if you use it to cast a bonus action spell, and you have your action available you can also cast a 2nd spell that turn so long as it is a cantrip with the casting time of 1 action.
Reaction: You only get 1 of these a round (not turn) and can use it to cast a reaction spell (if the conditions of the reaction spell are met) at any time on any turn.
A reaction spell could be used on your turn and be stymied by the Bonus Action Spell cast rule. You cast Healing Word, a Bonus Action spell. An enemy Counterspells it. It is still technically your turn but, you can't Counterspell his Counterspell. Why?
A spell cast as a Reaction falls into trying to cast another spell during the same turn, it does not count as a cantrip with a casting time of 1 action.
In regards to the concept of a bonus action cantrip... are there any cantrips with a bonus action casting time?
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Your rule on Reactions is incorrect...if you cast a bonus action, you cannot cast a reaction on the same turn (other turns in the round are ok). The rule for bonus action says you cannot cast another spell on your turn, except for a cantrip with a casting time of one action. That means reactions are out (not an action to cast) and leveled spells are out (not cantrips). But as soon as your turn ends, reactions can be cast again (provided you don't use it on something else)
The way the bonus action rule is worded ("You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action"), the only spells that can be cast on your turn must meet both requirements (cantrip, casting time of one action). Reaction spells use your reaction, not an action, so they don't meet the second requirement, and with no official reaction cantrips, any reaction spell would also not meet the first requirement either.
They have established a rule (you can't cast another spell during the same turn) and an exception (except for a cantrip with a casting time of 1 action). since the rule excludes all other spells that turn, and reaction spells don't meet either criteria for the exception (and wouldn't meet the second even in homebrew), they are not able to be cast until your turn is over.
If they wanted to allow reactions on the same turn, the bonus action rule would have to either modify the rule ("you can't cast a spell using your action during the same turn...", for example) or modify the exception ("except reaction spells or a cantrip with a casting time of one action", for example).
Seriously, why are we saying you can't cast a reaction spell if you've used a bonus action spell? Reactions are completely divorced from action/bonus action... The BA Spellcasting rule does not say you can/can't cast a spell as a reaction because it doesn't need to; the interaction is specifically between action/bonus action, and spells with a casting time of 1 reaction are defined separately.
Besides, if it were true, that would be analogous to saying any caster using a bonus action to cast a spell (which is, y'know, basically everyone) is unable to counter-Counterspell. That's a pretty ******* important interaction to not directly address, and while it may be a niche interaction, it's incredibly commonplace in actual practice. A less niche, yet also highly common interaction, would be Shield and opportunity attacks. If a caster has used a bonus action to cast any spell, and something they do provokes an OA from an enemy, are we really saying they are unable to cast Shield as a reaction to that? That a caster can't cast Feather Fall when applicable?
I would very much expect the BA spellcasting rule to say "You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action, and you cannot cast any spell as a reaction on that turn", or for the Reaction spellcasting rule to say "If a spell can be cast as a reaction, the spell description tells you exactly when you can do so, but cannot be cast on the same turn if you have already cast a spell with a bonus action."
Alternatively, if you haven't done anything with your action/bonus action yet? What happens when you start your turn by moving, provoking an OA, and casting Shield as a reaction? You're then completely barred from casting any spell as a bonus action for the remainder of your turn? That doesn't pass the sniff-test. There's no way in hell such a complicated set of interactions is RAW or RAI without the rule being written in far more detail than it is.
You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
For what it's worth, the Sage Advice Compendium has addressed this specific situation. Stipulated:
Official Rulings
Official rulings on how to interpret rules are made here in the Sage Advice Compendium. The public statements of the D&D team, or anyone else at Wizards of the Coast, are not official rulings; they are advice. The tweets of Jeremy Crawford (@JeremyECrawford), the game’s principal rules designer, are sometimes a preview of rulings that will appear here. A Dungeon Master adjudicates the game and determines whether to use an official ruling in play. The DM always has the final say on rules questions.
So here's what the document has to say:
Can you cast a reaction spell on your turn? You sure can! Here’s a common way for it to happen: Cornelius the wizard is casting fireball on his turn, and his foe casts counterspell on him. Cornelius also has counterspell prepared, so he uses his reaction to cast it and break his foe’s counterspell before it can stop fireball.
So: Original RAW, nope. RAW revised by SA Compendium, yup. RAI, yup. DM's call in the end? Yup.
https://media.wizards.com/2020/dnd/downloads/SA-Compendium.pdf
The rule says "during the same turn" and that is pretty plain english without any need for clarification. the only exception given is the cantrip/one action option. Other turns during a round are not your turn, so shield would be valid 99% of the time (the 1% being the improbable moments you need it on your turn), including during every other turn that round.
You may think its a bad rule, but the RAW is about as plain as it can be. A turn in which you cast a bonus action spell is a turn in which you cannot cast any other spell, unless it meets the specific requirements of the exception, which reaction spells don't.
That addresses the question "can I cast a reaction spell on my turn?" not the question "can I cast a reaction spell on my turn when I have cast (or plan to cast) a bonus action spell?". I'm answering the second question
I misunderstood. It explains that you can cast a reaction spell when you've just cast a spell with your action, not your bonus action. Thanks for the clarification.
I'm not that bright, so maybe that's what's holding me back here, but I struggle to find the benefit of ruling that way.
Except the problem is that what you're saying equates to "If you cast a spell as a reaction on your turn, you are unable to cast any spell as a bonus action", and that is simply far too removed from any written or intended interactions to be a valid interpretation.
You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.
Why is it that far removed though? its the same as if I cast a leveled action spell on my turn...
If I cast Fireball on my turn , I can't cast Misty Step later
If I cast Shield on my turn, I can't cast Misty Step later
Its not any harder. Again, I'm not saying its a well written rule, but as written, in plain language, both of the above statements are true because the rule says "during the same turn" regardless of action/reaction/etc
It's not that complicated, once you trust that the rule says what it means instead of what you want.
Normal rule: like any other activity on your turn, you can cast spells with the action type that they tell or a feature you to use: action spells with an Action, bonus action spells with a Bonus Action, or reaction spells with a Reaction.
Exception: if you cast a spell using a bonus action, "You can't cast another spell during the same turn," except (1) a cantrip that (2) takes an action to cast.
So Action + Reaction? Fine.
Action + Action (using Action Surge)? Fine.
Action + Action (using Action Surge) + Reaction? Fine.
Bonus + Action? Fine, but only if the Action is a cantrip.
Bonus + Action + Action (using Action Surge)? Debatable, but probably not. "cantrips with a casting time of 1 action" would have been more natural language to use if it was intended to be permissive for multiple action cantrips.
Bonus + Reaction? No, because a reaction spell is not "a cantrip with a casting time of 1 action."
Bonus + Action + Reaction? No reaction, see above.
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I'm going to make this way harder than it needs to be.
A big discussion, but i still have a simple doubt.
In my turn can I cast a leveled action spell and in that same turn can I cast a reaction spell? (I will not cast nothing in bonus action).
If yes where can I find that rule description, or someone in Sage advice addressing it.
We are talking about two different things. Readying a spell is an action, in which you cast the spell and hold the energy. A Reaction spell is a spell that has a casting time of one reaction.
The bonus action rule says you cannot cast another spell on your turn except for a cantrip with a casting time of one action. Whether you cast or ready that cantrip that would be allowed. But that is entirely different from a reaction spell like shield where the casting time is actually "one reaction"
You usually cannot release a readied spell as a reaction on your turn (technically you can, but the sequence of events to have a trigger release on the same turn you set it is highly improbable), and you lose the ready at the start of your next turn, so you can't hold a readied spell into your next turn.