Tresserhorn is for those Mages out there who prefer the dark arts over those the Mages' Guild practices. It's a large tower, located in a separate worldspace that's attached to the rest of the world via the Ancient Gateway in the northern mountains. When the player arrives there, any pursuers will be attacked by the undead which inhabit the frozen valley. All undead within this worldspace are friendly to the player and respawn if killed. After passing through the valley, you will arrive at the tower itself, next to a frozen lake.
Here are a few of the ideas I've gotten for this mod:
Recruitable undead; the lake is full of zombies, the catacombs beneath the tower contain liches, and skeleton archers guard the crypt to the east.
Necros Altar: sacrificing bones to this altar will reward the player (though I'm not yet sure what with)
Tome of Death: Teaches the player to summon a wall of bones around a target and possibly other spells
A Cattle Pen for Vampires
Please leave your thoughts. All comments welcome.