Death & Decay

you cast A 20-foot-radius circle on the ground of red blood boiling appears, centered on a point with in  range and lasting for 4 rounds. boiling noises that can be heard up to 30 feet away. 

 and the area is difficult terrain. Any creature that starts its turn in the area takes 4d6 Necrotic damage. and one less d6 if the creature in in the area for all 4 rounds. 

creatures make a DEX check against your spell dc on a sucess Thay Tacke 1/2 damage. on a fail Thay take full damage