Skeletons in the closet

You open the double doors and a harrowing site greets you. Skeletons of many men and other creatures litter the floor locked in eternal combat. It looks like a great battle was fought in the room. Against the far wall you can clearly see the leader of the defending forces and his personal guard fighting to their last. Some of the Skeletons appear to be frozen as if time has stopped for them in motion. Others are scattered in piles on the floor and some are bent over as if the weight and length of battle has been upon them for all this time. Clearly lingering magics have aided in keeping this battle in pose for such a long time.
While the air is dry you find hints of mold reaching your nostrils. The faint sound of water can be heard beyond the next door where the leader and his band stand. While nothing useful could have survived for this long your curiosity drives you to explore this forgotten sepulcher.
As you move through the mass of bones the sounds of snapping and crunching fill the air. While not scary it is certainly disconcerting as you make your way looking for anything of value. Your torches light the way as shadows play off of the bodies making seem like they could be moving but your sure they are not. As you come to the other side of the room you can now see the leader in his regalia. Tattered cloth clings to the fragile skeletal frame. Its head bearers a small circlet of copper long tarnished and yet not corroded. The spears of his guard bristle outward making it difficult to approach and the area around them is surprisingly free of debris. You notice, in the skeletal leader's hands, a rod of about 30 inches in length lacquered in red with silver bands that encircle it every 5 inches. At its top is a gem that seems to shine in the darkness, while not generating light itself you can see it clearly. As you get closer the gem begins to pulse as if sensing life. A chilling breeze whips through the room and you can hear the creak of the double doors closing behind you slowly. You steal yourselves for you know now there is little chance of escaping through the door in time. A voice sounds in the darkness, "To the last my brothers.... make them pay with their lives!". The gem on the rod flares to life and you can see the shadows playing off of the skeletons but this time you are sure that they are moving. Skeletons burst up from the plies of bones on the ground while other groups of standing skeletons turn to face you in a formation. You take in the site of a mass of skeletons all around you and it is clear that you have but one course of action. Fight!