I've been creating a few Spells for D&D 5E recently and wanted to fill the gap of lacking Acid spells for one of my Black Dragonborn players.
I wanted to compose a spell that involved the caster pulling a corrosive substance from the ground and causing it to shatter earth in an area, causing clumsy stepping creatures to receive acid damage.
I expected that this spell would be a Transmutation spell as it physically draws corrosive substances from under the earth, as it was my understanding that Transmutation involved in the transforming, transferring or translocating of substances. Rather than creating them, which is my impression of what Evocation is.
Before I introduce it I'd like to have certainty of what School it realistically is most suitable for, Transmutation or Evocation?
If anyone would like the spell's full details or if you'd like to use it for yourself, it's fully detailed and formatted below:
Shaman, Sorcerer, Warlock, Wizard
Casting Time: 1 Action
Duration: 1 Minute
The ground around you in a 30ft area cracks and twists; an acidic compound bubbles up between the gaps and burns all of those foolish enough to misstep. This area also becomes difficult terrain. Each creature within the spell’s area of effect must make a Dexterity saving throw or step in the acid and take 1d4 Acid damage on a failed save. If a creature in this area moves from its space, it must make the saving throw again or be subjected to the damage. Any creature that goes prone in this area takes 2d4 acid damage and must make the save again when attempting to stand up. When this spell ends the acid soaks back into the ground, however that ground remains difficult terrain.