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In the novel, yuder does not reveal his abilities to anyone in his new life. He used only a few natural elements in front of people at most. Anyone learning his full capabilities was him revealing his ultimate weakness, anything unnatural, as he has no control over them whatsoever. Referencing ch 1, they had tied him down with unnatural monster materials- that's why he could not free himself and escape death.
That is the reason I was quite surprised that he casually told Kiolle the extent of his abilities, def did not happen in the novel and could get a little confusing in future chapters of the webcomic.
eh we'll see, we'll see ╮(￣▽￣)╭ (￣∇￣")