The Exorcists use a variety of esoteric titles such as Brother-Initiate, which signify membership to the secretive [[Orison|Orison Cults]]. These cults are an important part of Chapter identity, and they open their

Certain Orison Cults do maintain historic association with certain battlefield roles, with many First Company veterans belonging to the '''[[Enochian Guard]]''' while the '''Obelisk Thelemus''' attracts many [[Techmarine|Techmarines]]s and [[Devastators|Devastator]]s. The Broken Tower cult is almost exclusively formed from [[Librarian]]s. Membership to one cult does not preclude membership to another, and highly regarded heroes of the Chapter may have a multiple of Orison honours to their name.{{Fn|13}}

Despite their similarities to the [[Grey Knights]], the combat doctrine of the Exorcists differs greatly. Unlike the Grey Knights, the Exorcists possess no special resources other than hardened resolve to fight the Daemonic, and are more strategically flexible due to their adherence to the [[Codex Astartes]]. They are known for their effective reconnaissance and large use of [[Scout|Scouts]]s, deploying them behind enemy lines to collect intelligence. Indeed, many of these Scouts undertake combat duties that would normally be reserved to fully fledged battle-brothers. A favoured tactic is to work neophyte forces into positions where they appear vulnerable and then reveal them, drawing out the enemy by giving them a false sense of tactical advantage before crushing their advances with the full weight of the Exorcists’ main force. Since the introduction of [[Primaris Space Marine]]s, they have made great use of [[Vanguard Space Marine|Vanguard]] formations.{{Fn|13}}