Yuzdeep is the youngest son of Raadu and the only surviving member of the Xeel family since its exile from Kasshta Keep and all of Adar's monastery-fortresses. An Endseeker cult raised Yuzdeep from a young age. Thoroughly indoctrinated, Yuzdeep has a deep hatred for the monastic orders of Adar and for Riedrans. He is a psychopath who wants nothing more than to see the word returned to its primordial state, but his plotting is careful, and he works to remain unknown or to seem friendly. Currently, he and his followers have designs on the chaotic scar of Uutkleza, but Yuzdeep hopes to find the key to awakening Ran Iishiv. The calculating warlock (Complete Arcane 5) has already uncovered hints at the true contents of Korrandar.
If you have access to Tome of Magic, Yuzdeep could be a truenamer/fiend binder instead of a warlock. Even if he's not, some of his powerful followers could be. Yuzdeep has a Leadership score of 14, and his followers and cohorts form a fanatical inner circle of his Endseeker cult.