Allergen Compound Gas Grenade

Self-defense equipment that Yujin gave to Kate as a gift, to protect her from the Vulgus.

It was modeled after the exterior of a medical drone with its wings folded.

Its internal cylinders are filled with a diluted Proliferating Allergy solution, which can be discharged forward and sprayed in an emergency.

Yujin, its creator, warned Kate not to use it on people, but it is harmless to the human body.