Fics like Fyreclaw

Harry is bitten by werewolf Remus, triggering his dormant X-gene inherited from grandfather Logan. The mutation violently reacts with residual basilisk venom and phoenix magic, transforming him into something new: bone claws wreathed in phoenix fire, venom-coated talons, enhanced body. In a berserker rage, he slaughters dozens of Dementors at the lake, saving Sirius before collapsing.

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