@OladipoAdigun He gets weaker in the sense that he wouldn't be able to use his flames anymore if he were to run out. He's been passively absorbing the sun's energy without output, so he's good for a long while, but if he were to find himself out of flames, and in the night, he wouldn't be able to use one of his key strenghts. It's not like the moon weakens him or something, just that it doesn't give him energy like the sun. I think him running out of flames will happen during Elbaf or whatever comes after. He wasn't weaker on Onigashima, just at risk of becoming weaker if his flames did run out.