Acidic Blob

You touch a creature and leave a sticky blob of acid behind. Make a melee spell attack against the target. On a hit, the target takes 1d8 acid damage and is stuck with a blob of acid until the end of its next turn. While stuck, a creature subtracts a d4 from all its attack rolls. A tiny metal object (such as a lock) hit by this spell begins to dissolve and is destroyed after 1 minute. This spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).