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After the new chapter I think his brother may have been Vanar's reencarnation and he made a deal with the dragon god, or maybe he made a bet, like he bet on his brother being able to do everything he did and being able to kill all the dragons if he had a good body, because it has been mentioned that his body was in a bad state, and maybe he put his own existence in the bet, and if the MC does win the bet for him, then he comes back? I don't know, just some kind of deal has to have been made, maybe his brother thought he couldnt win against this dragon god, and so he bet on his brother being able to win?
....starting to get tge feeling he IS the reincarnation of that Vanar guy. Or a part of him?
Was his brother really a brother?
Something weird is going on here.
It's as if the brother planned for Rudd to take his place if things went wrong.