Thane's Acid orb

you create 3 orbs of Acid that you then hurl at a target making a separate attack roll for each. On a hit the target takes 5d6  acid damage regardless of if the attack hits or misses the orb of acid bursts and dissolves into a thick Miasma that spreads out to 10 ft. all creatures in the 10ft radius must make a constitution saving throw on a failed save they are poisoned until the start of your next turn.
for every 2 spell slots above  4th add an additional orb of acid