celestial beings are weak which is why even if they're a high being, they're often enslaved due to them being weak but dark celestials are strong like the grand duke and heroes. MC is the remaining golden celestial which are weak and since his race are the only thing that's changed, he's still gonna be weak and its also because he's not from Elix's world originally which is why his body can't adapt (ex. is eating food which can also be a reason why he's often sick bcs he couldn't eat on the earlier part of the story)
This help me to understood it more directly although I know it too ٩(๑❛ᴗ❛๑)۶
But why is the MC so weak.(▰˘◡˘▰)? like weak weak