That is a potential duration problem, though, not a concentration problem. And it is at most a one round problem, so if you can extend the summon spell even just one round somehow (sorcerer or metamagic adept), that problem goes away.
Let me give an example: If you use summon greater demon, and summon a barlgura to a magic circle, and you begin casting planar binding on the barlgura, that will force you drop concentration on the summon greater demon. After that happens, the barlgura will only still be around per the spell for 1d6 rounds, so at most 36 seconds, which is not nearly long enough for planar binding. The debate I'm referring to is whether or not the magic circle can keep the barlgura there after the 1d6 rounds have passed (at which point the demon would normally just vanish away), and thus long enough for the casting of planar binding to finish.
I always assumed that the setup described in planar binding involved more than one spellcaster working together, and I think it makes for a more interesting narrative when the caster needs to get someone else aboard their crazy demon scheme.
As for OP's question, I think the whole point of wish is to be "broken." It represents the upper bound of PC power in a package that allows the DM some say in where that boundary is - either by just saying no to some things or by instituting harsh drawbacks/consequences to go along with the wish. The only thing I might change about it would be to connect it to a boon or magic item or something so the DM has full explicit control over whether the PCs come across the spell or not (instead of just having to ban it if you don't like it).
As for OP's question, I think the whole point of wish is to be "broken." It represents the upper bound of PC power in a package that allows the DM some say in where that boundary is - either by just saying no to some things or by instituting harsh drawbacks/consequences to go along with the wish.
The problem is with the minor version of wish (which is no-cost/no-risk), not with the major version.
Planar Binding requires no concentration. You can do other things while maintaining concentration, even cast other spells as long as they do not need concentration to maintain.
Planar Binding itself doesn't require concentration, but the casting of the spell does. You cannot concentrate on another spell while casting a spell with a casting time longer than 1 action.
Longer Casting Times
Certain spells (including spells cast as rituals) require more time to cast: minutes or even hours. When you cast a spell with a casting time longer than a single action or reaction, you must spend your action each turn casting the spell, and you must maintain your concentration while you do so. If your concentration is broken, the spell fails, but you don’t expend a spell slot. If you want to try casting the spell again, you must start over.
I always assumed that the setup described in planar binding involved more than one spellcaster working together
I suspect the designers didn't really think the process through. Planar Binding appears to be derived from a mix of the Planar Binding and Planar Ally spells from 3.x (or the Ensnarement and Exaction spells from AD&D), but none of those editions had a concept of concentration.
In any case, the way you accomplish planar binding in 5e for a single caster involves Glyph of Warding. Which is another good Wish cheese -- use it to cast glyph of warding at 8th level, use it to store a spell of up to 8th level, and immediately trigger it, making the spell no longer require concentration.
In any case, the way you accomplish planar binding in 5e for a single caster involves Glyph of Warding. Which is another good Wish cheese -- use it to cast glyph of warding at 8th level, use it to store a spell of up to 8th level, and immediately trigger it, making the spell no longer require concentration.
My original suggestion, which kickstarted the whole conversation, was to just use wish to copy planar binding directly. Though I did acknowledge the glyph of warding trick earlier.
Incidentally, rather than changing any mechanics of Wish, balance issues could probably be dealt with via a consumable material component. A 5,000 gp gemstone is the type of thing that tier 4 PCs should be getting out of treasure hoards and certainly won't stop people from using Wish, but it will make people think carefully.
Out of curiosity, if a wizard uses wish to copy planar ally or commune, how do these work if the wizard has no deity?
However the DM decides :D
I imagine if you use planar ally, since you're not buddies with whichever entity you contact, they might exact a price from you even beyond what you have to pay the ally you get. Like for example, Asmodeus likely isn't sending you a pit fiend for free.
I like that genie warlocks can use wish to copy planar ally. The warlock can just ask their genie patron to send help against the BBEG.
Out of curiosity, if a wizard uses wish to copy planar ally or commune, how do these work if the wizard has no deity?
However the DM decides :D
I imagine if you use planar ally, since you're not buddies with whichever entity you contact, they might exact a price from you even beyond what you have to pay the ally you get. Like for example, Asmodeus likely isn't sending you a pit fiend for free.
I like that genie warlocks can use wish to copy planar ally. The warlock can just ask their genie patron to send help against the BBEG.
"The being must be known to you" for planar ally, so the caster at least needs to know who they are invoking. The summoned being is not obligated to obey no matter what the Wizard's deity is, if any.
Yeah that's what I mean. If the wizard doesn't have a deity, they might research someone (as it does give you the option of a god, demon prince, primordial, and such, so I imagine even archdevils and archfey are on the table too) who would be even remotely willing to send a buddy to help a random wizard who rang their number. Might even preemptively try to establish a partnership with that entity with contact other plane prior to attempting the planar ally.
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Let me give an example: If you use summon greater demon, and summon a barlgura to a magic circle, and you begin casting planar binding on the barlgura, that will force you drop concentration on the summon greater demon. After that happens, the barlgura will only still be around per the spell for 1d6 rounds, so at most 36 seconds, which is not nearly long enough for planar binding. The debate I'm referring to is whether or not the magic circle can keep the barlgura there after the 1d6 rounds have passed (at which point the demon would normally just vanish away), and thus long enough for the casting of planar binding to finish.
I always assumed that the setup described in planar binding involved more than one spellcaster working together, and I think it makes for a more interesting narrative when the caster needs to get someone else aboard their crazy demon scheme.
As for OP's question, I think the whole point of wish is to be "broken." It represents the upper bound of PC power in a package that allows the DM some say in where that boundary is - either by just saying no to some things or by instituting harsh drawbacks/consequences to go along with the wish. The only thing I might change about it would be to connect it to a boon or magic item or something so the DM has full explicit control over whether the PCs come across the spell or not (instead of just having to ban it if you don't like it).
My homebrew subclasses (full list here)
(Artificer) Swordmage | Glasswright | (Barbarian) Path of the Savage Embrace
(Bard) College of Dance | (Fighter) Warlord | Cannoneer
(Monk) Way of the Elements | (Ranger) Blade Dancer
(Rogue) DaggerMaster | Inquisitor | (Sorcerer) Riftwalker | Spellfist
(Warlock) The Swarm
The problem is with the minor version of wish (which is no-cost/no-risk), not with the major version.
Planar Binding itself doesn't require concentration, but the casting of the spell does. You cannot concentrate on another spell while casting a spell with a casting time longer than 1 action.
I suspect the designers didn't really think the process through. Planar Binding appears to be derived from a mix of the Planar Binding and Planar Ally spells from 3.x (or the Ensnarement and Exaction spells from AD&D), but none of those editions had a concept of concentration.
In any case, the way you accomplish planar binding in 5e for a single caster involves Glyph of Warding. Which is another good Wish cheese -- use it to cast glyph of warding at 8th level, use it to store a spell of up to 8th level, and immediately trigger it, making the spell no longer require concentration.
My original suggestion, which kickstarted the whole conversation, was to just use wish to copy planar binding directly. Though I did acknowledge the glyph of warding trick earlier.
Out of curiosity, if a wizard uses wish to copy planar ally or commune, how do these work if the wizard has no deity?
Incidentally, rather than changing any mechanics of Wish, balance issues could probably be dealt with via a consumable material component. A 5,000 gp gemstone is the type of thing that tier 4 PCs should be getting out of treasure hoards and certainly won't stop people from using Wish, but it will make people think carefully.
I imagine if you use planar ally, since you're not buddies with whichever entity you contact, they might exact a price from you even beyond what you have to pay the ally you get. Like for example, Asmodeus likely isn't sending you a pit fiend for free.
I like that genie warlocks can use wish to copy planar ally. The warlock can just ask their genie patron to send help against the BBEG.
Yeah that's what I mean. If the wizard doesn't have a deity, they might research someone (as it does give you the option of a god, demon prince, primordial, and such, so I imagine even archdevils and archfey are on the table too) who would be even remotely willing to send a buddy to help a random wizard who rang their number. Might even preemptively try to establish a partnership with that entity with contact other plane prior to attempting the planar ally.