In my homebrew Cerulean Lord was a title he took, but I also used the same name for my Advanced Being (Legends of Athas Revisited (House Rules)) as he was planned to be the first to get there. He hasn’t actually started that path yet, but he’s working on getting the required psionic and magical mastery.
I created a template for when he got out of the storm that gave him some storm powered abilities, I’ll dig it up and post it. I think he advanced a few levels by the time I actually used him, but you’ll get the idea. Student of Rajaat was also a homebrew prestige class, I’ll see if I can dig that up too.
Template and Prestige class are likely a bit controversial, I subscribe to the idea that SMs are for all intents and purposes gods in Athas and when matched against real gods, the real thing they are missing is the divine hit dice and powers, and that with very few exceptions, they can only grant followers spells when both are on Athas.