They don't even have to go in detail to show us, how he recovers step by step all his power, just show us a training montage where he is able to read ALL the books in the library and practice the spells and at the end of it since he slowed down the time to the max barely any time would have passed outside the tower.
Speaking of which I hate that Anya and Bredita automatically now feel like they can come to the tower without the MC's permission just because he has a demon there. My tower, my rules, none of your business. No invite, no entry. It would be interesting if they try to enter and are automatically locked out or prevented because they not invited. I mean it was created by a powerful being stronger than they ever will be so the security should prevent them entry.
It would also be interesting if next they meet MC he has regained all the power and knowledge the tower can give him or even surpass that so they can't boss him around. Seriously it has gotten annoying with how he is supposed to be this super all powerful magical being but is still acting and being treated like a doormat. In terms of progression he still is nowhere near where he needs to be. I remember a different magic theme games like Love of Magic or Sorcerer where you actually saw the progression of a newbie sorcerer to by the end of the game a Master of magic. You saw the growth in power and abilities while at the same time having huge amounts of sex, but here not so.
