Because it was filled.
The King's Soul appeared within the Royal Artifact, completely filling the empty container.
The Royal Artifact now seems to emanate an aura of transcendence, and the emitted golden light inevitably brings to mind Yanor Londo, the place where the Royal Artifact was initially obtained.
Looking at the filled Royal Artifact, everyone present revealed expressions of relief; the difficulties and challenges they faced on their journey seemed like just yesterday, making even the recollection tiring.
But looking at it now, all past efforts were worthwhile!
Leon caressed the filled Royal Artifact, and before him appeared a luminous path leading to Gwyn. He retrieved the Royal Artifact again and said, "Let's go, it's time to find that lazy serpent."
Flament had once told the adventurers that once they fill the Royal Artifact, they should bring it to him. Now was the moment to trigger the next step of the storyline!
