Your patron has gifted you with a taste of their brass and brimstone, infusing the scarred black lines on your skin. When you take damage from a melee attack, you can use your reaction to cause the lines on your skin to whip off and strike back at the attacker, dealing your Charisma modifier in (magical) slashing damage to the target that hit you. In addition, you gain immunity to poison damage and you are immune to the poisoned condition.
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