Zach belonged to a criminal organization known as Death Spreading Brigade. He came from a poor background and had no class or manners. He was extremely bitter and cynical with no remorse for his actions. As a child, his parents sold his beloved sister Lilia into slavery. Following his third stint in the army, he left to join the Death Spreading Brigade which needed new members.
He was hired as a servant and carriage driver by Sebas, posing as a butler to Solution Epsilon. He led them to an ambush on the road outside of E-Rantel by ten members of the Death Spreading Brigade. Fully expecting this treason, the Nazarickians let Shalltear Bloodfallen butcher the ambushers. Too scared to flee, Zach was led a little bit away by Solution in which Zach hoped to rape after the ambush, but instead was ingested by her, a slime monster.
He was slowly digested alive, his agony lasting two days.