Leather Harness of Undead Slaying

is one of nine powerful Ephemeral Relics that can sometimes be found in different areas in New Britannia. These items can be equipped by Tamed or Summoned creatures.

''This leather harness is embossed with glowing pictograms depicting XXX in various death poses. This extremely rare and powerful Ephemeral Relic cannot be repaired and features a very low durability, so this item can only be utilized for a short period of time before it is fully depleted. Once depleted, salvaging this item for potentially valuable crafting materials.''

Found
This item is rumored to be found somewhere within the Well of Aldur, Northwest Blackblade Mountains, Ulfheim, Myrkur and Ruins of Utheim...