Fury of the Abyss

You learn to call on your hellfire to serve your commands. You gain the following benefits:

• You can cause your blood to ignite until dispelled by you as an action. While your blood is ignited, your maximum health is halved (rounded down), but your melee weapon attacks deal additional fire damage and you gain access to the hellish rebuke in this mode. Your maximum health can still be affected by buffs and debuffs that affect maximum health like the aid spell. Your maximum hit points won't return until dispelled by you as an action.
• In this mode, you wreathe your held melee weapons in flames. On a hit, the target suffers the weapon attack’s normal effects and an additional 5d4 fire damage, and you can cause flames to leap from the target to any creatures of your choice that you can see within 5 feet of the target that deal the same amount of fire damage.