Say you are staying at one location for a week. At the end of the day, you cast the Mansion spell which lasts 24 hours. You go inside, sleep for the night and regain your spells. You spend the next day doing whatever you need to do and get back before the Mansion duration ends. If you cast the spell again, will this increase your duration by and additional 24 hours or does it create a new doorway and expel whomever was in the Mansion when the spell ends?
Bringing this to other spells with a long duration, could you use open spell slots to maintain the spell past the duration. Hex, for example, has a duration of 1 hour. If, by some chance, the creature is still alive at the end of the hour, could you spend a 1st level spell slot to maintain the spell for an additional hour instead of casting it anew?
Thank you for your reply. Would you happen to know where I could find that in the rules. I did a search for Duration, but the Search function here is kind of lousy when looking for specific answers. Again, thank you.
I checked the PHB, DMG, Xanathar's, Sage Advice, and errata and I can't find it. The only note on extending spell duration I found was the Sorcerer's metamagic extend spell which allows them to double the duration of a spell. Otherwise if you cast a spell with a duration of concentration and then recast it before the end of the duration the first casting will end (casting a concentration spell breaks concentration) and the new casting will take effect. Otherwise I think you can overlap the durations of multiple castings of the same spell. It will not increase the effects, but I would allow it to function as a continuing duration. For spells like magnificent mansion you would of course need a set of the material components for each casting.
If there is a rule about the it would be great to know where.
There are a few spells that specify that casting them every day for a year makes them permanent, but only a few spells do that.
If I was the DM I’d allow a second casting before the end of the first casting of Magnificent Mansion to extend it. It’s harmless and doing that doesn’t have any impact game balance, it’s just flavor.
The same spell can't stack with itself, so only the stronger or more recent application applies. You also don't stop concentrating on a spell until you start concentrating on another spell. So if you target the same target with the same spell, the same effect applies using a new duration, effectively extending the spell.
Concentration ends when you begin casting a concentration spell. It does not last until the new concentration spell takes effect. Keep this in mind if you need the effect of a concentration spell not to "flicker" while you recast it.
All that really means is that the 2 concentration spells never overlap. There is no indication of how long the flicker is, actions have no set time (a turn is 6 seconds not an action). So as long as the casting time is an action (bonus or re-), as far as I'm concerned the flicker is practically instantaneous.
I'm not sure I really agree with the instantaneous flicker effect of losing concentration. I don't think they would have been so explicit in XGtE about losing concentration the moment you start casting a concentration spell rather than at the end if it didn't make a difference. It might not be 6 seconds but it's got to be at least 1?
Say you are staying at one location for a week. At the end of the day, you cast the Mansion spell which lasts 24 hours. You go inside, sleep for the night and regain your spells. You spend the next day doing whatever you need to do and get back before the Mansion duration ends. If you cast the spell again, will this increase your duration by and additional 24 hours or does it create a new doorway and expel whomever was in the Mansion when the spell ends?
Bringing this to other spells with a long duration, could you use open spell slots to maintain the spell past the duration. Hex, for example, has a duration of 1 hour. If, by some chance, the creature is still alive at the end of the hour, could you spend a 1st level spell slot to maintain the spell for an additional hour instead of casting it anew?
If you're gonna be a bear...be a Grizzly.
Spells that target can have their durations refreshed by recasting the spell.
In the case of magnificent mansion, it is up to the DM a little, but I'd say it can be refreshed without expelling anyone.
Thank you for your reply. Would you happen to know where I could find that in the rules. I did a search for Duration, but the Search function here is kind of lousy when looking for specific answers. Again, thank you.
If you're gonna be a bear...be a Grizzly.
I checked the PHB, DMG, Xanathar's, Sage Advice, and errata and I can't find it. The only note on extending spell duration I found was the Sorcerer's metamagic extend spell which allows them to double the duration of a spell. Otherwise if you cast a spell with a duration of concentration and then recast it before the end of the duration the first casting will end (casting a concentration spell breaks concentration) and the new casting will take effect. Otherwise I think you can overlap the durations of multiple castings of the same spell. It will not increase the effects, but I would allow it to function as a continuing duration. For spells like magnificent mansion you would of course need a set of the material components for each casting.
If there is a rule about the it would be great to know where.
There are a few spells that specify that casting them every day for a year makes them permanent, but only a few spells do that.
If I was the DM I’d allow a second casting before the end of the first casting of Magnificent Mansion to extend it. It’s harmless and doing that doesn’t have any impact game balance, it’s just flavor.
Professional computer geek
The only rule you need is the "combining magical effects" section of spellcasting a spell rules (https://www.dndbeyond.com/sources/basic-rules/spellcasting#CastingaSpell) and some logic.
The same spell can't stack with itself, so only the stronger or more recent application applies. You also don't stop concentrating on a spell until you start concentrating on another spell. So if you target the same target with the same spell, the same effect applies using a new duration, effectively extending the spell.
Concentration ends when you begin casting a concentration spell. It does not last until the new concentration spell takes effect. Keep this in mind if you need the effect of a concentration spell not to "flicker" while you recast it.
All that really means is that the 2 concentration spells never overlap. There is no indication of how long the flicker is, actions have no set time (a turn is 6 seconds not an action). So as long as the casting time is an action (bonus or re-), as far as I'm concerned the flicker is practically instantaneous.
I would go with a near instantaneous flicker as well.
Polymorph and Wall of Stone become permanent if you maintain concentration fo rah full hour of the spell duration.
I doubt we are going to see a return of the 1e Extension spells as that effect has been subsumed by the Sorcerer's metamagic.
What's the point of having a magnificent mansion if you have to move in every time?
Pretty sure that should answer the question haha.
Read the first chapters. Feel free to critique. Will link the next chapters at the end of the first. Two stories running so far.
Simeon Tor:
https://www.dndbeyond.com/forums/d-d-beyond-general/story-lore/34598-simeon-tor-chapter-1-the-heat-of-battle
The Heart of the Drow:
https://www.dndbeyond.com/forums/d-d-beyond-general/story-lore/36014-heart-of-the-drow-chapter-1
I'm not sure I really agree with the instantaneous flicker effect of losing concentration. I don't think they would have been so explicit in XGtE about losing concentration the moment you start casting a concentration spell rather than at the end if it didn't make a difference. It might not be 6 seconds but it's got to be at least 1?
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