I haven't found that either, however the music style is similar to the original Conan the Barbarian music by : Basil Poledouris
Also, Age of Conan game music is also based on Basil's, which is also spectacular by Knut Avenstroup Haugen
Enjoy!
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"I am a nightblade. Blending the disciplines of the stealthy agent and subtle wizard, I move unseen and undetected, foil locks and traps, and teleport to safety when threatened, or strike like a viper from ambush. The College of Illusion hides me and fuddles or pacifies my opponents. The College of Mysticism detects my object, reflects and dispels enemy spells, and makes good my escape. The key to a nightblade's success is avoidance, by spell or by stealth; with these skills, all things are possible."
^ Nope, That's what I thought at first - Sands of the Alik'r was my first choice. It seems that this song that I'm searching for isn't on the official ESO soundtrack. And that is unfortunate. It's a great atmospheric piece of music.
Sometimes I go to Stros M'kai just to listen to the music and admire the environment.