When you use an improvised weapon, it becomes as deadly as anything designed for the job. It takes on the profile of any existing weapon of a similar size or shape: A teacup becomes brass knuckles or a punch dagger; a shard of glass becomes a knife; a thrown shoe becomes a throwing hatchet, etc. It must appropriately fit something of a similar size and shape, as described in the examples listed. This benefit lasts until you no longer hold the object, or until it breaks, or until you are no longer using the object with any Warrior Skill — whichever comes first. In the case of thrown objects, the benefit extends until impact. A hurled shoe strikes with the force of a tomahawk and then becomes ordinary footwear when it hits the ground. This is compatible with Master of Weapons, though still adheres to the set limitations.