and, how about:
Gorynyches can attack with all their heads at no penalty, even if they move or charge during the round.
A gorynych can be killed either by severing all its heads or by slaying its body. To sever a head, an opponent must make a successful sunder attempt with a slashing weapon. (The player should declare where the attack is aimed before making the attack roll.) Making a sunder attempt provokes an attack of opportunity unless the foe has the Improved Sunder feat. An opponent can strike at a gorynych’s heads from any position in which he could strike at the gorynych itself, because the gorynych’s heads writhe and whip about in combat. An opponent can ready an action to attempt to sunder a gorynych’s head when the creature bites at him.
Each of a gorynych’s heads has one third of the creature's full normal hit point total. Losing a head deals damage to the body equal to half the head’s full normal hit points. A natural reflex seals the neck shut to prevent further blood loss. A gorynych can no longer attack with a severed head but takes no other penalties.
A gorynych does not die from losing its heads until all its heads have been cut off. A gorynych goes on fighting until all its heads are lost; the only penalty it incurs is fewer bite attacks when it makes a full attack.
Any attack that is not (or cannot be) an attempt to sunder a head affects the body. For example, area effects deal damage to a gorynych's body, not to its heads. Targeted magical effects cannot sever a gorynych’s heads (and thus must be directed at the body) unless they deal slashing damage and could be used to make sunder attempts.