[@Holy Soldier]

I'm just a lowly Co-GM, but the problem I have and our powerful all might GM, I think has, is that if he's able to keep all of these abilities, then he basically becomes unstoppable later down the road since he would be able to pretty much do [i]everything[/i]. Even the abilities of other Godslayers if he fights them. Which is ridiculous, and makes the point of other Godslayers completely moot down the line.

Saying that he has to be exposed to a certain ability a number of times to adapt and has a limit is a good idea, I think.

Having him to have to consciously choose which abilities to keep in his 'storage' would be much more effective. Every time he learns another, then he has to throw another out and decide if its worth it or not. Plus, coming up with creative ways to use these adaptations together would be an extremely effective weapon. Obviously, at higher ranks he could have more abilities and likely be able to use them to full effectiveness.

just my two cents. Best to wait on [@Sarcelle Renard] for a complete answer.