Dhezhan's Oldest (Un)Living Resident

In the pyramid that stands in the midst of the Stardust Desert lives the oldest being known to all of creation. Although he reached his personal zenith of power during the height of the Dhezhan empire, this creature has existed far longer than any mortal creature; perhaps he has even existed since the beginning of the world, though even he can no longer recall his earliest years in the wake of the Dhezhan brightness. This creature is a rip-off of Mumm-Ra, the Ever-Living from Thundercats. His existence is primordial and axiomatic, though his power and influence wax and wane throughout the millenia. Even at a time when his power wanes to the point of isolated confinement within his exotic tomb, this being enjoys almost unparalleled ability in the magical arts. I need to find some questions to answer about him in order to flesh him out sufficiently. Suffice to say that this is no mere lich or mummy but a nigh-deific power.