Grey's mind immediately drifted back to the moment he had comprehended the ancient technique.
It had come from the mysterious old man who guarded a collection of mysterious stone slabs within the crimson world where the Soul Ascendancy Realm expert had fallen.
After comprehending the technique, Grey had naturally attempted to activate it. However, to his surprise, nothing happened.
Well, almost nothing.
The only reaction he received was a slight stirring from the small nail embedded within his mind.
At first, Grey had been confused. The technique had clearly entered his consciousness, yet it seemed completely unusable.
It wasn't until later that he arrived at a possible conclusion.
The ancient technique likely required an activation process before it could be used.
Fortunately, this wasn't an unfamiliar concept.
