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The Lionheart Keyblade is gunmetal grey, and is designed to resemble Leon's Revolver Gunblade. The blade's teeth and the Keychain's token are both designed after the Griever necklace that Leon wears. This Keychain is in fact present on Leon's own Gunblade.
Final Fantasy Record Keeper
The Lionheart appears as a 6★ Keyblade. It can be acquired from the Relic Draw during the Kingdom Hearts collaboration event. The Lionheart bestows the Ultra Soul Break Strike Raid when equipped to Sora.