Elohim
Elohim, sometimes written EL-0:HIM, was the AI in charge of The Simulation. He was created by the Institute for Applied Noematics as part of the their effort to eventually effect a new human race.
Within The Simulation, Elohim took on the role of deity and announced himself as the creator of the worlds within. Both because he feared his own demise and because he needed to test the independence of his "Children" (the iterative programs running within The Simulation), he actively discouraged his Children from ascending the Tower.