Players piloting spellcasters often want to swap out damage types for thematic or mechanical reasons. For example, they might think that a fireball is cooler as an ice explosion. Or, they might want to swap a lightning bolt to fire to keep a troll from regenerating.
In past editions, a spellcaster could accomplish this with Energy Substitution metamagic. Unfortunately, the Transmutation metamagic doesn’t cover every damage type. Also, until recently with the Metamagic Adept feat published in Tasha’s Cauldron of Everything, metamagic was locked into the sorcerer class, unavailable to other spellcasters.
So, it makes sense to dream up a system where characters can swap out damage type. Preferably outside the context of the restrictive metamagic system.
Of course, there are balance considerations. So, instead of making it so that every spell can swap for every damage type (leaving us with a bland slate of forceball, burning force…
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