Yumi Kisaragi’s improvised blast device from ZOMBA Squad, a one-use explosive assembled from scavenged parts during the outbreak.

Yumi’s Improvised Blast Device is one of the most dangerous artifacts connected to ZOMBA Squad.
Built from scavenged parts, exposed wiring, warning labels, taped casing, and a crude timer, the device was never meant to be elegant or reusable. It was made for one purpose: to create enough force, noise, and chaos to change the squad’s odds when there were no safer options left.
For Yumi Kisaragi, the device represents her particular kind of survival instinct. She does not wait for perfect tools, official weapons, or clean solutions. She builds what she needs from whatever the ruined world leaves behind, then trusts her own nerve to use it before everything falls apart.
As an artifact, the blast device captures the desperate creativity of ZOMBA Squad: ordinary people forced to improvise under pressure, turning junk, fear, and timing into one more chance to escape.