Chosooth is an iksar vampire that was appointed commander of Kurn's Tower. Emperor Rile was the iksar ruler that placed Chosooth in charge of that tower of torment during the Elder Age. However, this does not mean that Chosooth was a creation of Rile. Most vampires that exist within the Iksar Empire are the result of Venril Sathir's foray into the necromantic arts.
Kaesora was an ancient temple built in the Field of Bone in the early ages of the Iksar Empire. Xalgoz, a sarnak vampire and Sathir loyalist, would not inhabit the ruins of the ancient temple until the Age of Turmoil.
It must also be mentioned that, although Kurn's Tower was named after the then existing warlord Kurn Machata, he did not oversee its operations. Kurn Machata was based in Warslik's Wood where he led an extremely sadistic and bloody campaign against the giants. Chosooth was placed charge of all operations of a second tower that would duplicate the terror of the Warslik's Wood tower. The second tower of torture was originally referred to as, simply, the Kurn. This became confusing to historians. Many placed Kurn Machata in Kurn's Tower and Chosooth in Kaesora. Evidence of Chosooth would be found within the palace of the temple city Kaesora. He no doubt spent time there since it was adjacent to the Kurn.
LINK
(Vhalen) Re:A Tour of Norrath, Vol III: Kunark
