Game Twenty-Five: The Well of Souls

In the 25th game in Dragonreach, the Resurrectors' Guild hired a band of heroes to track down and slay several rogue apprentice necromancers, who had stolen the guild's secrets and were enacting a ritual to construct their own "Well of Souls" - a potent device to channel necromantic energies - in the Cairn Hills.

The heroes battled their way into a castle whose walls were fashioned out of writhing undead, and confronted the leader of the rogue necromancers in the caverns beneath it - over a glowing pit that spewed forth new ghosts and specters with each passing moment!  

Fortunately, the ritual was disrupted and the necromancers either slain, scattered, or tossed screaming into the Well itself.