While wandering the world (modded), I discovered two towers whose decades-long conflict has finally broken out into open war. (Both describe the other as being "bone-chilling horror".)
Weiwang Ropehill, an outworlder sorceress who learned both the secrets of the Drunken Master and the secrets of the Netherrealm, constructed the tower of Boardedpalace in the year 59. From there, she began a lengthy campaign against a nearby oni civilization, The Just Witch, resurrecting the slain onis as powerful demon thralls and revenants, as well as conducting horrible experiments and producing a variety of strange monsters.
(There's also a bit of a drama triangle in Boardedpalace's history surrounding one formidible character, Zhipei Whipriders, an outworlder who was trained in both arts by Weiwang's apprentice, then murdered by the very same apprentice/master, and finally resurrected as a revenant by Weiwang herself, giving him the durability of a revenant, the combat prowess of a drunken master, AND the ability to summon attack skulls and raise zombies. Weirdly though, I have seen him fighting zombies - not sure if they are naturally hostile to him for some weird reason or if there was just a loyalty kerfluffle.)
In the year 104, a new magic-user had arisen in the world. This one was a centaur named Ban Tormentmess, who learned the power of soul stealing, allowing him to change form to any sapient creature in battle. He constructed the tower of Wraithgnarled in 144, a stone's throw away from Boardedpalace.
In the year 176, Weiwang confronted Ban. The centaurian smashed Weiwang's neck, and she retreated to Boardedpalace.
Their conflict was at a level of skirmishes when my adventurer arrived in the year 200. After some time building a reputation by slaying nearby giants, the conflict had finally erupted into open war. I approached Weiwang, requesting to become a soldier, and was accepted. The demons and revenants are all quite friendly, though I do have to carve my way through a field of zombies whenever returning to the tower for new orders. So far the only requests have been megabeast related. I'm still waiting for the order to attack Wraithgnarled.