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Piloted by heretics guilty of a terrible crimecrimes, they have been given one of this is amongst the worst imaginable punishments available to the [[Imperium]]. A multitude of wires and chemical injectors are implanted into the heretics heretic's spine, which are then attached to a mechanical suit of destruction. When not engaged in outside of combat, their 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 for of danger, knowing that only in death , can forgiveness can be earned.

Those condemned to pilot a Penitent engines are often individuals who were once seen as pious by the Ecclesiarchy, such as [[Priest]]s or [[Battle Sister]]s. As a result, the Sisters of Battle consider it a sacred duty to witness these great fearsome machines in combat, observing the actions of their fallen brethren as they atone for their sins.{{Fn|1}}