Marcy's Crossbow

Marcy's Crossbow is a wrist-mounted range weapon that Marcy Wu can put it on and off her right forearm when she came to Amphibia. Can fold its two limbs plus hide an arrow when not in use. Other than able to shoot different crossbow bolts (such as a flaming bolt), the crossbow helps Marcy to swing round for faster and smoother traveling similar to Marvel's Spiderman but with one hand only.