Gods of Ragnarok's universe

The Gods of Ragnarok's original universe was a matter of some contention.

As recounted in The Record of Rassilon, Rassilon classified the three Gods of Ragnarok among the "Great Old Ones", members of the earlier race of Time Lords who ruled the universe before his own who survived into the new universe in godlike forms. He believed the three — Raag, Nah and Rok — to have been responsible for the destruction of this universe, however, and speculated that they may actualy have destroyed "countless universes" before that one, including their true, long-lost world of origin. (PROSE: Divided Loyalties)

The quantum harvester believed that the Gods of Ragnarok came from a reality home to various death gods who had invaded the Doctor's universe, including the Beast, (COMIC: Cindy, Cleo and the Magic Sketchbook, Old Girl) who claimed to have originated from before the Doctor's universe. (TV: The Satan Pit)

Behind the scenes

 * In his notes for The Quantum Archangel, Craig Hinton asserts that the Gods of Ragnarok came from the universe before the Great Old Ones' universe, and were one half of that universe's Six-Fold-God alongside the Gods of Armageddon (Arma, Gedd, and Onn). Much like the Six-Fold-God of the Doctor's universe, they were the equivalent of the Time Lord High Council of their reality, with Hinton saying that one of the Gods of Armageddon must have been their universe's version of the Doctor. (Shelf Notes)