Machuahuitl of Quiahuitl

Weapon (macuahuitl), rare (requires attunement by a cleric or paladin who serves Quiahuitl)

This machuahuitl is carved from heavily lacquered dark wood and set with rows of gleaming obsidian teeth. The flats of the club bear engravings of a serpent coiled around a cornstalk set above a flooded plain. A tightly wrapped snakeskin covers a long wooden handle tipped with a collection of six heron feathers dyed orange and blue that dangle from a woven string.

You gain a +1 bonus to attack and damage rolls made with this magic weapon. As a bonus action, the weapon deals 1d4 necrotic damage to you by siphoning off a portion of your lifeforce as a sacrifice to Quiahuitl. When you do so, the weapon deals an extra 1d6 radiant damage until the end of your turn. You do not deal extra damage if you have resistance or immunity to necrotic damage.