Naturally, it felt startled in its heart, because with its current cultivation realm, it hadn't even captured the trajectory of Mo Yang's departure, and even his aura had directly vanished from its perception.
Then it muttered again, "Using oneself as a furnace to drain away soul power until almost nothing is left... Not only is this kid ruthless, but he really is a lunatic..."
The reason the Four-Legged Divine Dragon said this was because Mo Yang's approach was indeed fundamentally different from the Sword Saint's Soul-Nourishing Technique. Mo Yang extracted his soul power, but still stored it within his body, merely sealing it inside his Spirit Palace. In this way, as Mo Yang's own soul power grew and his cultivation advanced, the soul power stored within his body would also undergo a transformation and grow along with it.
Chapter 586