Staff of Arcane Compulsion

Enemy units attempting ot charge the bearer or his unit must subtract 2 from their charge roll.

A model that suffers one or more unsaved Wounds from a weapon with this special rule is reduced to Initiative 1 until the end of the following Assault phase.

Any Psyker that has one or more weapons with this special rule knows the Force psychic power in addition to any other powers they know.

Force - Warp Charge 1
Force is a blessing psychic power that targets the Psyker and his unit. All of the targets' weapons that have the Force special rule gain the Instant Death special rule until the start of your next Psychic phase.