Realm of the Primes

The Realm of the Primes is a place from the Robots in Disguise portion of the Aligned continuity family.

The Realm of the Primes is an ethereal plane somewhere. Members of the Thirteen can reshape it to their will.

Fiction

2015 Robots in Disguise cartoon

After becoming one with the AllSpark, Optimus Prime ended up in the Realm of the Primes where he began training to face an impending threat, Out of Focus though the Primes allowed him to appear in the material world when Bumblebee's need was dire. W.W.O.D.? Micronus was able to create a hill and manifest humans and a robot foe for Optimus to fight. Out of Focus