Penitent Engines are heavy hitting melee units of the Sisterhood, they fire Flame Cannons to cast Flame Strike to deal continuous damage, but does not harm friendly units.

LORE:
These valiant constructs of war were once created by the Imperial's Skunk Works, it was deemed too dangerous and can harm any human being. So they decide to scrap this prototype until the Sisterhood admired the idea. Instead of scrapping, they retaining it and using this volatile construct to good use. It was manned by a fallen Sister, her body was entombed in a construct and unleash its fury against their enemies. It can also fire a flame cannon to deal overtime damage.

Update on 02/07/23: Improved animations.