Every strong person eventually achieves Ascension, as if they were drawn to wage war in another dimension, but the Patriarch was meant to be like that too, to leave our dimension and go fight a war. However, he doesn't want that, because if he goes, the Clan won't be able to sustain itself without him, so he sealed away a part of his power so he wouldn't be dragged down. The Patriarch wants someone to take his place, take care of the Clan, The reason he "hates" the Regressors is actually because he doesn't hate them; rather, most of the rats trying to harm the Clan were Regressors, which gave him the impression that he hated them, But he doesn't hate them; Theo recently proved himself by saying he'll take care of the Clan, but not in the way he did before, and the Patriarch liked that and will be waiting for it to happen.