Acid Bomb

You toss a bomb of acid. Choose a target  spot on the board, all creatures on that spot must succeed a dexterity saving throw or take 1d8 acid damage, all enemies within a 
5 ft radius of that spot have to succeed a dexterity saving throw or take 1d6

This spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).