The '''Osiron Class Dreadnought''' was a type of Contemptor used by the [[Thousand Sons]]. These dreadnoughts were created by [[Magnus]] himself, and consisted of a mortally wounded [[psyker]] Space Marine laced with a psychometric barrier protecting his brain. This allowed the Dreadnought to perform psychic abilities that was far safer to the user and its allies.{{Fn|7c}} As such, these Dreadnoughts were equipped with [[Force Weapon|Gravis Force Blade]]s and [[Æther-Fire Weapon]]s.{{Fn|11b}}.

Records indicate that not long before the [[Council of Nikaea]], Magnus gave the schematics to create such Dreadnoughts freely to the other Legions, though it is likely most spurned this gift entirely.{{Fn|7c}}