Digestion

You extend your hand and contort your fingers as if crushing a soft, vulnerable object in your palm. One creature within range must make a Constitution saving throw. Creatures without any kind of digestive tract are immune to this spell. On a failed save, the target creature takes 8d4 acid damage, and it must spend its next Action clutching its gut and vomiting hot, stinking bile all over itself. This causes another 4d4 acid damage on its next turn, and all creatures within 5 ft. of the vomiting target must make a Dexterity saving throw or also take 4d4 acid damage. On a success, the creature takes half as much of the initial acid damage and the spell does not induce any vomiting. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 in all instances for each level above 3rd. At 6th level and above, if a creature fails its Constitution saving throw and vomits, it gains 1 level of Exhaustion until the end of its turn following the one in which it had emptied the contents of its stomach.

This homebrew spell is among a small selection of Acid magic created for a campaign featuring a player-character who wished to expand their spell list to align with their Sorcerer's Draconic Heritage. Many such spells are attempts to re-flavor existing magic under an acid theme – this one is my personal favorite among them. To view the whole list, please reference my username, Grumbler, while searching. I'm happy to accept and consider any criticism or insight in the development of these spells.