The Ordo Reductor was the destroying arm of the Mechanicum, a sub-cult devoted wholly to the art of unmaking. Where the wider priesthood pursued knowledge and creation, the Reductor turned that same rigour toward demolition, studying the precise stresses that would collapse a bastion, the exact yield that would crack a hull, the surest way to reduce any strongpoint to slag and dust. Its magi were siege-engineers of terrible genius, and its ranks bristled with demolition-automata, breaching charges, and heavy ordnance built to level walls the Titans themselves might struggle to breach.
In the campaigns of the Great Crusade the Ordo Reductor was called upon whenever a fortress had to fall, its patient, methodical destruction a science as much as a war. When the Heresy split the priesthood, the Reductor's grim skills were coveted by both sides, for a war of sieges and shattered worlds had need of those who understood destruction as a discipline. Its adepts brought the same cold calculation to the ruin of the Imperium that they had once brought to its raising, and where the Reductor set its engines, no wall stood for long.
Mechanicum
Order of battle
The The Ordo Reductor field the units of the Mechanicum — a detachment from the roster:
Kindred formations
Other Mechanicum formations
Taghmata of MarsThe modular forge-hosts of the Red Planet, the taghmata gather thralls, cohorts and battle-automata into a single relentless machine of war marshalled by the magi of Mars.
The Dark MechanicumThe traitor priesthood of the Schism, the Dark Mechanicum threw open the forbidden vaults and bound the warp into their machines, forging horrors no loyal adept would dare conceive.