Body of Cinders

When you invoke your Crimson Rite (Rite of the Flame), you may suffer an addition 1d4 rite damage to transform your skin into a lava like-crust. You gain resistance to fire damage, and any fire damage you take gives you Burning Armor*. At the end of your next turn, the molten crust flakes off revealing your original form and removing these benefits. You may use this feat once per long rest.

*Burning Armor - Your melee attacks are now all critical hits, with your doubled dice as fire damage.

Adapted from Embers to Inferno by Kugo