Why?
Ryu looked at the brass halberd Aria had swung at him. Trapped on his finger, there wasn't much that she could do at all.
The power to control Fate in a world that was capped at the mere Lord Grade was too powerful. There were no powerful individuals here that could even begin to contend against this new Soul Nature to him. And worse than that, Ryu had a far higher natural affinity for Fate and Karma than he ever did for Space and Time.
Since his birth, he had been steeped in this comprehension thanks to his eyes. Every ability of his Mysteries of Heaven and Earth Pupils manipulated Fate on some scale or another.
The simplest ability of his Mysteries of Heaven and Earth Pupils, [Third Perspective], allowed him to view the world from a bird's eye view. But the reason most couldn't even begin to detect it was because it used Fate to observe things. Even Dao Gods had difficulty grasping such a thing, let alone normal cultivators.