Piloted by heretics guilty of terrible crimes, this is amongst the worst imaginable punishments available to the [[Imperium]]. A multitude of wires and chemical injectors are implanted into the heretic's spine, which are then attached to a mechanical suit of destruction. When outside of combat, chemical implants inject feelings of guilt and pain directly into their brains, reminding them of their sins. Driven by their pilot's frantic need for forgiveness, Penitent Engines charge towards enemy forces heedless of danger, knowing that only in death, can forgiveness be earned.