Fiends of Slaanesh

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

Any foe in close combat with the Fiend counts any fumble rolls at double value. At the same time, any critical hits caused by the Fiend's enemy are ignored