Brent's Bathing Bucket

You select an area of a 10-foot cube above which a spectral bucket appears. Creatures in that space make DEX saving throws or take 3d8 cold, acid, or poison damage (caster's choice). The area is considered difficult terrain for one minute and the ground does an additional 1d8 of the chosen damage to creatures who start their turn in the space or move through it during their turn.

When you cast this spell using a level 3 spell slot or higher you do an additional 1d8 of the chosen damage per spell slot level for both the initial damage and the lingering area damage.