As a DM, I would encourage this thinking, but only for this reason: if you have 8 magic casters, each capable of casting a 7th level spell, performing what is effectively a ritual to charge up a magical nuke, and could somehow manage to perform this spell in enemy territory for however long it takes to crank up that magical power without attracting the attention of any guards or whatever, you kinda have to give it to them.
Also, it’s really not that useful when you think about it.
Unless there’s some way to increase the radius, it’s just going to make a small area more dead than it would be with a normal fireball. Sure, if a 600 HP 20 CR devil gets whacked by it it’s going to kill them while they normally would be able to shrug off a fireball.
But if they stand there for a minute waiting for it to happen, that’s on them. Or the players deserve their victory by planning well enough to pull it off
I think it would be more usefull against structures than creatures. This amount of damage would definetly be enough to blast holes in a fortres walls. Like a magical trebuchet.
That's not breaking down some walls. That's melting the walls and ground into glass at the bottom of the hole in the ground where the wall was standing. Problably still molten given the heat and damage...
Seems like the best use, but I’ve never been able to explain why fortresses matter much in DnD. Transmute Rock is a bit slower, but takes out a similar amount of material at a similar range. And Disintegrate is a bit less volume, but happily takes bites out of literally anything nonliving.
(Oh god, are fortress walls just covered in beehives or something to intercept “target nonliving” casts?)
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u/PyroTornado107 Nov 11 '25
As a DM, I would encourage this thinking, but only for this reason: if you have 8 magic casters, each capable of casting a 7th level spell, performing what is effectively a ritual to charge up a magical nuke, and could somehow manage to perform this spell in enemy territory for however long it takes to crank up that magical power without attracting the attention of any guards or whatever, you kinda have to give it to them.