If someone had become a fifth level immortal using the simplified version of Yale's Path, the power obtained would have been just slightly superior to that of the Curse Lady, but that difference wouldn't be too great.
However, Yale was training the complete version which used the pure energy that he obtained when he became the owner of a lower universe.
Thus, his power was still increasing, which provoked that the Curse Lady started to feel fear.
Although she felt that the power emanating from Yale wouldn't be enough to exterminate the whole army in an instant, it would be impossible for them to flee until defeating Yale.
Moreover, since not even the Everlasting Curse worked, the Curse Lady already assumed that curses would be useless against Yale, and the army specialized in curses.
Yale was an opponent that nullified their greatest strength, which turned him into their nemesis.
The pure energy started to spread from Yale's body while merging with Yale's own energy.
