Dark Old Demon
I mean the further it goes the more plot holes there are... So many missed opportunities with how he uses the system. Also didn't it mention how it had the same amount of magic as the mc? So forget about an x10 increase it should of at least doubled his magic... but I guess plot stuff so yeah. I mean why did he have to test out the abilities? Just absorb the body and check its status with the system. He can then modify it so it has the same strength etc as him last time. He can then also feed it another devil fruit or something. If you compare to last time to this, then this is so sloppy it's not even funny. Prob also realised how op it is and changed it xD I mean he is already probably middle class? demon lord with weird abilities times all his stats by 10 and adding more abilities on top of that? He becomes the pinnacle of demon lord maybe even touch demon king or even become demon king level. So yeah broken af