Cauldron Bubble

A 20-foot square centered on a point within range of any liquid you can see instantly comes to a boil. If a creature is in the liquid, it takes 3d8 fire damage at the start of their turns as long as it’s in the boiling liquid. If the creature leaves the boiling liquid, they take 3d8 fire damage for an
additional turn as the liquid on their skin or clothing cools down.

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