Blob of poison

A blob of green fumes and liquids is formed and now floating. The blob will stay afloat until it hits an intended target. The blob can fly 20ft purn turn and will pop spilling it's insides on the target that it is on (touches). When the blob is popped the target will suffer 4d4 acid damage on a failled constitution saving throw and half of that on a succesfull one. The target will be considered poisoned for 2 rounds and for each it will take 2d4 on a failed DC 15 constitution saving throw or half of that on a succesfull one.

When you cast this spell using a spell slot of 3rd level or higher, the damage (both initial and later) increases by 1d4 for each slot level above 2nd.