Believe it or not, this is a wagon that acts like a carry-on baggage. A hammerspace inventory where he keeps all of his clothes, jewelry and other items to show off to people.

He can also use this as some sort of AoE offensive weapon. He can project very fragile weapons and store them inside while he fires them at a reasonable distance of... eight meters? The weapons break and act as shrapnels to stagger Masters. Bonus if it hits someone and then breaks.