Beast of Nurgle

The Beast will attempt to remain within 6" of its master at all times. The two form a special unit and must obey unit coherency rules

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

The Beast of Nurgle has D6 Attacks in close combat, check each round. No armour saving throw is permitted for models wounded by the Beast

Multiple attackers do not receive the usual bonuses when attacking the Beast, no +1 for extra Attack for each opponent after the first, nor the +1 close combat modifier for each opponent after the first.