Coat yourself in rage, igniting yourself for 1d8 turns. While ignited, you have vulnerability to all non-fire damage types. Additionally, all of your melee attacks deal an additional 1d8 fire damage. Any enemy grappled by you while you're ignited is caught on fire for 2d4 turns or until they expend an action to douse themselves. While on fire, they take 1d8 fire damage a turn.
This ability can be done once per short rest.