A desaturated blue vest with green sleeves. A utility belt hangs from the left shoulder, and armbands embroidered with a red-and-black skull decorate the wearer's arms. A wooden ax protrudes from the user's upper back. The user's lower arms and hands are now mottled and have a cyan hue. Part of the vest is also torn.
- It was part of the Bio Hazard bundle/equipment (the bundle is now known as Monster Gear).
- Bio Hazard, the Elite Enemy that wields the Blunderbuss, wears this along with the entire set of Monster Gear.
- Before Halloween 2014, it was unlocked at level 27 and provided 5% Health. The description said, "An undead radioactive body...sounds great!" It was also obtainable at the time for 105 .
- After the Halloween 2014 update, it received a special ability which decreases 40% the damage of Warlocks tagged weapons, in this case, the Haunted Guns or the Darkness Combo Guns. It also has no level requirement anymore and it can be achieved by beating tier 13 in the Monster Mash. The description was changed as well.