Crimson Moon

Controlling the flame within, make a melee spell attack against the target. On a hit, the target takes 10d10 fire damage, this bypasses resistance completely and immunity to fire damage is treated as resistance. The user must then succeed a CON saving throw, resulting in 2 levels of exhaustion on a failure. On a success, they are unable to use this spell until they've completed a long rest.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d10 for each slot level above 6th.