Genestealer Patriarch

If charged by an enemy causing fear, take a psychology check. If passed, fight as normal. If failed, automatically break if outnumbered by charging enemy. If enemy does not outnumber, half the units WS (rounding up) in the first turn of combat and cannot fire overwatch. 
If charging enemy unit that causes fear, must take psychology check. If failed, cannot charge and must remain stationary for the turn (but can fire normally). 
If hit by a weapon that causes fear it must take a Break test regardless of casualties inflicted by the weapon

If this model is the army commander then any Cult broods that have a model within 12" of him may use his Leadership value when they take a Leadership test.

Immune to all psychology. Cannot be affected by fear, terror, or any of the psychological factors in the Warhammer rulebook. 
Still affected by Break tests like other troops