User blog comment:Khalael/Canon Discussion 4: Sensei, Perpetuals and the Illuminati/@comment-2253300-20140911004853/@comment-24909831-20140911071439

I agree with this. Though, if no plausible parameters for the perpertuals can be named, I'd say they should be banned alltogether.

I'm not however all familiar with the Sensei-Illuminati-StarChild part of lore, but as I'm aware, if they are "removed" from canon friendliness, you, at the same time, remove lots of stuff from Realm of Chaos books, Inquisition War Trilogy (with Jaq Draco) and even 3rdE Rulebook seems to have references to those things. This is not the same thing as with RT-era, where almost everything is rewritten later into other form so we can all agree that RT-era stuff, mostly, is not canon friendly. With Sensei-Illuminati-Starchild trio, there might actually be quite amount of stuff in later editions too, references and such.

When reading about the Perpetuals and comparing them to Sensei, I don't even think they are actually the same. While Perpetuals seem to be "genetically modified, immortal, beings", the Sensei are sons of the Emperor, bred by his drifting soul. Correct me if I'm wrong, but I think there is actually a slight difference between perpetuals and senseis, big enough to separate them from each others.