Seethe, reconciler of the undying

Weapon Evil, Magical Very Rare [Necromancy, Enchantment, Requires Attunement]

A fairly large and wide blade made out of obsidian is held by a grip wrapped in skin of unknown origin. The blade had a largely curled cross-guard with a single red gem placed in it that glows when activated along with a single rune placed on the blade itself.   -using a bonus action you can let the sword fly 30ft and attack a creature in that range. -While the blade is hovering you can use a bonus action to move it another 30ft and attack again. -After 4 rounds after activation, it returns to your hand where you have to reactivate it. -If you kill an enemy the user attuned to the weapon gains (Character level+charisma Modifier) Temp Hp and every undead in a 20ft radius around the sword is healed (2d4+4).