Board Thread:Lore Discussion/@comment-108.253.68.177-20131021030335/@comment-9212235-20141124152219

It's called Mantling. "Walk like them until they must walk like you." The two beings involved become so similar that the universe can't tell them apart. When this happens the mantler becomes the mantlie. Basically, over time the HoK became crazy and walked the path of Sheogorath. Personally I believe it started in Knights of the Nine because the HoK also mantles Pelinal who is also crazy as balls.