Robe of Blades (3.5e Equipment)
From D&D Wiki
Robe of Blades: Dark and well weighted; a robe of blades is a seemingly normal robe ending in either 2, 4 or 6 blades. These blades cannot be enchanted although each one is hollow leaving room for a small elemental canister. Each blade regularly deals 1d6 damage per succesful hit. There are two strengths of charge, one dealing 1d6 elemental damage another dealing 1d10; the 1d6 charge costs 50 gold and the 1d10 elemental charge costs 100 gold.