Aquila Favonia is a Sword in Genshin Impact that boosts Physical Damage and ATK but also regenerates Health when taking damage! You can get this Weapon via Wishes. The weapon’s effect is Falcon’s Defiance:
ATK is increased by 20%. Triggers on taking DMG: the soul of the Falcon of the West awakens, holding the banner of resistance aloft, regenerating HP equal to 100% of ATK and dealing 200% of ATK as DMG to surrounding enemies. This effect can only occur once every 15s.
Builds that can use this Weapon are: