The party retreats towards the gates. The slower-moving undead cannot keep up even with the pace of the short-legged halflings and dwarves and quickly vanish within the darkness, but the skeletons are fleet-footed and quick. Eldwyn's Holy Symbol sends a few of them fleeing, while Kordunn's Magic Missile combined with a hit from Kylest's greatsword smashes one and Thunder's axe and Selvaggio's club another, but there are more streaming out of the shadows from all sides now. Elmus sends a bolt or two against them, but must stop, so he is not lagging behind. Intrepido, as much as he likes bones, doesn't dare to get close to these unnatural creatures. They smell wrong. Completely wrong.
The adventurers decide to make a stand just behind the gates, where they have a choke point to aid their defense, but suddenly the undead stop and retreat. Back into the darkness.
The thunder grows weaker and the lightning flashes become less and less, and between them, there is only silence.