Infestations Any Nurglings included in an army may be set up at the start of the battle if you want, and do not have to be summoned to the battlefield. Note that you can choose to summon Nurglings if you wish, it's just that you don't have to.
Nurglings cannot be banished back to the warp.
Fear 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