Sylvora's Infernal Terrain

The ground in a 10-foot-radius centered on a point with range bursts into blue and orange flames. Any creature that starts and/or ends its turn in the area must make a Dexterity saving throw or suffer 2d4 fire damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The Fire damage increases by 1d4 for each spell slot level above 3. In addition, if the spell is cast as a 5th level spell or higher, individuals hit by spells that deal Fire damage while in the radius of the spell suffer another 1d4 fire damage.