Acidic Brew (TCB)

A spout of acid sprays from your hands in a line 30 feet long and 5 feet wide in a direction you choose. Each creature in the line must succeed on a Constitution saving throw or be covered in acid for the spell’s duration or until a creature uses its action to scrape or wash the acid off itself or another creature. A creature covered in the acid takes 2d4 acid damage at start of each of its turns.

Note: this spell is not entirely homebrew. Bonus points if you know what the spell actually is. :>