Force 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.
Soul Blaze If a unit suffers one or more unsaved Wounds from an attack with this special rule, it is set ablaze and continues to burn - mark it with a coin or counter as a reminder.
At the end of each turn, roll a D6 for each unit with a Soul Blaze counter on it. On a 3 or less, the flames die out and the unit is no longer ablaze - remove your reminder counter. On a 4+, the unit takes D3 Strength 4 AP5 hits with the Ignores Cover special rule. These Wounds are Randomly Allocated. A unit cannot have more than one Soul Blaze counter on it at a time.
Transmogrify Any To Wound roll of 6 made by an attack that has this special rule gains the Instant Death special rule. If any models are slain in this manner, then you may immediately place a new Chaos Spawn model under your control as close as possible to where any of the slain models were standing, but more than 1" from any enemy models.