I’ve read plenty of novels were the female cast gain power ups from the MC via various means… and the most common would be semen.. So yeah once that bit happens or if it happens… doubtful(IMO) all of the girls he does things with will likely be boosted in some way.

It’s been on the boarder of H-scenes from the beginning but we never see Renya take that final step. I’m not saying it won’t happen but I feel like even if it does the Author would only give a vague descriptions while we get about half a chapter or more explaining about how they somehow mysteriously powered up without even understanding it themselves.

His body and powers were also granted to him by and irresponsible loli goddess so who know’s what mysteries lie inside.

It’s something like a pact or ritual done to have Renya be accepted as an Ally during the war so the thorns won’t stop his movements. So one time thing with residual effect I suppose, she’ll probably get stronger as time goes on.

Politics doesn’t work like that, especially not during a time of crisis. The emperor can’t just tell his son, “Our entire country might get wiped out soon. You be the emperor now and take care of this.”

Warhammer 40K The Space Elves called Eldar were at the height of their civilization and hedonism took over to such a degree that their perverse emotional power birthed a daemonic god of Pleasure and desire that wiped out 90% of them in one go.

Care to elaborate on that my good friend?
Is that a reference to something? Do tell…

Probably all of those exceptions were by lost or those decended from lost (after all if you have a elf wife you will want an elf child and God knows this)