Zedrihar will free the slaves. While scouting the villages, he will use the emerald to make sendings to the leaders of all the other armies, being made aware of the new arrivals by Axorius and Dan & Zan. "There are many oppressed and starving villagers along the moor and sea; many kobolds and humans. I would suggest that we liberate them - any with unlimited teleportation abilities might be wise to spend time bringing food and supplies."
Once he begins to near it, Zedrihar eyes the pit warily. He moves near to it and calls out in a booming voice, "Attention! You give service to a master that has been declared in violation of the primary tenet of the Second Multiversal Law! In pursuance of justice, the Lich King and all subordinates will be executed. However, as defined under the fifth article of subsection 'a' of the Multiversal Law, you will be given this single chance to forsake your allegiance to him and take haven at the nearest city-equivalent that meets the requirements stated under subsection 'b.' If you choose to defy me and waive this right, the penalty is termination, to be carried out immediately. As a collective and as individuals, you have one minute to state your response."
He waits for their response. If any choose to take advantage of Zedrihar's offer, I'd like details about that so I can decide what to do. However, if none of them do, or if they attack Zedrihar, he'll wade in, using his at-will fear ability (DC 18) to send waves of panic among them, at-will greater command (DC 19) to cause them to flee, and his at-will mass inflict wounds to slay as many as possible, relying on his damage reduction and fast healing to make him effectively immune to their attacks. Zedrihar will not be trying to slay them all, rather, his primary goal will be to reach the pit and find out its purpose. If, for whatever reason, he's injured more than a few HP, I'd like more details so I can decide what to do. If anything other than mass confusion, panic, and slaughter happens, I'd like more details as well.