with major Hezul holy blood, with the only in-game characters being Eldigan and Ares. It gives +10 resistance and a whopping +20 skill, and has 30 might, along with the skill Critical. Apparently some Chunnibyou named Owain or something tried to find it later in time.
One of the best holy weapons from fire emblem: Genealogy of the holy war. Can be used only by people
Wait, so Ares comes with Mystletainn?! Mwhahahaha! Criticals! Criticals everywhere!