Possessing Teleporting Troops
(Rule)Description: Roll a D6 each time a model that does not belong to the Chaos army teleports in a battle where there are Daemon models waiting to be summoned. This applies to models teleporting by any means including Warp Spiders, Terminators and the Warp Jump Wargear card or psychic powers.
On a 1, the model is posssessed by a daemon, remove it from play and replace with a model from the Chaos player. Grey Knights and Inquisitors of the Ordo Malleus are immune to this