Brutal Macuahuitl (Patreon)

Weapon (longsword), uncommon

This tribal sword's sturdy wooden frame is lined with obsidian shards, allowing attacks made with it to deal either bludgeoning or slashing damage (your choice). In addition, the sword has been enchanted through numerous blood rituals by war priests. When you roll a 20 on your attack roll with this magic weapon against a creature, that creature becomes marked for death until the start of your next turn. A marked creature can't regain hit points, and when the mark ends, that creature takes 1d8 necrotic damage.

War leaves its marks on everyone who sees it. Some take scars that never heal.