I know this one is kinda dumb but I saw a thread in NU but i forgot to take down the name of the novel. The MC apparently cuts his own arm off to balance the weight in a dungeon (?). What I remember is that his opponent had a bigger corpse and his corpse was too skinny. So he gave up the first round. Second round he cut off his own arm to add to the weight. Third round, he won because the opponent didn't have much weight, I think. Anyways, that all I remember from the post. Looking for the namee~