Acht, an 18-year-old secondary antagonist, sports white hair cropped at his ears and piercing blue-green eyes, his face often concealed behind a mask. Driven by vengeance, he relentlessly opposes the protagonists, notably ambushing them during their flight after a man claiming to be Ilie’s father triggers their escape. His goal: capture Ilie for Adham’s forces, who plot to topple the Bazaar Overseer and convert Trade City E-05 into a containment zone dubbed the "insect cage." Tasked with military strategies, Acht ensures Ilie remains imprisoned in E-07, thwarting rescue efforts during the main tower infiltration. His actions mirror the power struggles fueled by the Cagaster disease, aligning him with factions capitalizing on the fractured post-apocalyptic world’s chaos to consolidate control.