Official GW 40K Errata and FAQ (7th edition link on page 7)

[manrogue]

Few notes from the gk faq

Grand masters, captains, libbys, draigi coteaz AND PSYKERS generate powers from the tables!
Even the vehicles are lv 1 getting banishment (-1 inv to daemons) and sanctuary (+1 inv)
Purifiers get the cleansing flame power from the rulebook which is awesome!

Yeah was looking at Grey knights last knight, Draigowing could be making a big return i think. 10 paladins (plus 4 Pyscannons etc) with Draigo, Coteaz and ally in Tiggy, aim for invisibility on your psychic powers. After have it, go for whatever you like to cause some pain (psychic maelstrom?) or added protection (4++?).

Boom, a bomb that can't be touched by templates or blasts but still kicks out a ton of pain.