Biohazard

You coat a 15-foot-wide cube with toxic sludge for the spell’s duration. The area is difficult terrain and filled with dangerous fumes. A creature that enters the area or starts its turn there must make a Constitution saving throw. On a failed saving throw, the creature takes 1d8 poison damage and is poisoned until the start of its next turn.

At Higher Levels. If you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.