The Iron Priests are part of the Space Wolves chapter and their duty is that of a Techmarine but with additions. An Iron Priest is required to keep the equipment of his Great Company in working order, maintain the machine spirits of its vehicles in addition to all other duties of a Techmarine.
 
He is also required to tend to the spirits of the Dreadnoughts in the depths of the Fang, and it is his duty to rouse them from their deep slumbers if they are needed in battle. Similar to their Techmarine cousins, Iron Priests usually pilot Space Wolves gunships and aircraft.