Archmage Randazzle's Unending Jihad of Diarrhea

 You conjure a portal to a plane of unspeakable horror deep within the bowels of the humanoid/creature targeted with this spell.

Target must make a DC 30 constitution saving throw or begin to suffer from explosive diarrhea taking 4d4+4 force damage each turn they are under the affect of Archmage Randazzle's Unending Jihad of Diarrhea. At the end of each of their turns the target must make a constitution saving throw equal to the previous saving throw reduced by 2 DC or continue to suffer this affect.

While under the affect of Archmage Randazzle's Unending Jihad of Diarrhea, the target falls prone, movement reduced to 0ft, and beneath them a pool of toxic diarrhea begins to spread out. One the 1st turn it covers the squares they occupy. On the 3rd turn, it spreads to cover all squares touching the current squares of toxic diarrhea. On the 5th turn it spreads again to cover all squares touching the current squares of toxic diarrhea. On the 7th turn it spreads again to cover all squares touching the current squares of toxic diarrhea.  Elevation is the exception to this spread, as the toxic diarrhea will not move up stairs/slopes/etc.

Toxic diarrhea is considered difficult terrain.

Anything moving through the toxic diarrhea must first make a DC 20 dexterity check or fall prone. Then they must make a DC 15 constitution check (DC 30 if prone) or loose their turn to uncontrollable vomiting. 

Anything beginning it's turn or entering a square covered in toxic diarrhea takes 3d10 acid damage.

Anything that falls prone in a square of toxic diarrhea will take 1d10 acid damage each turn until they spend an action cleaning themselves off with a cloth material or use magical intervention such as prestidigitation or conjure water directly onto themselves.

The target of the spell and any creature/humanoid that falls prone in the toxic diarrhea is covered - all gear on them magical or otherwise, will take 1d4 unpreventable acid damage per turn until it is destroyed. Nothing is immune or resistant to this damage. Gear covered in this way can be cleaned off by spending an action cleaning it with a cloth material or magical spell like prestidigitation, area spells like create water can clean everything caught in the effect at the same time.

Squares of toxic diarrhea will dry and become inert over a period of 24 hours. The caustic tar-like yet slippery consistency of toxic diarrhea prevents it from being cleaned off the ground by any means mundane or magical. It will eat down into the ground at a pace of 1 foot per hour, leaving behind a crater of desolation, fear, and shame.