Basic Rules, pg. 211
0-level (Cantrip) Conjuration
You hurl a bubble of acid. Choose one or two creatures you can see within range. If you choose two, they must be within 5 feet of each other. A target must succeed on a Dexterity saving throw or take 1d6 acid damage.
This spell’s damage increases by roll:1d6 when you reach 5th level ( 2d6 ), 11th level ( 3d6 ), and 17th level ( 4d6 ).