Burning Zone

When casted you create a zone of scorchingly hot air. Any creature that enters or leaves the zone takes 6d8 fire damage.

If a creature is in the zone for 3 rounds, they will suffer one level of exhaustion.

The creature must make a DC16 CON saving throw, on a success the creature takes half damage.

The area of the spell is Lightly Obscured by the immense heat of the spell.

Using at higher spell slots: The spell's damage increases by one d8 for every spell slot above 5.