A Horokudama was a weapon designed to wound and kill enemies by lighting its fuse, putting it into a large gun, such as the 112-gram matchlock, and firing it off.
焙烙玉の導火線に火を点けて、火縄銃の30匁筒など大筒に詰めて放ち、敵兵の殺傷を主目的とした兵器。