Grey's expression turned dark as he heard the name. He knew that this was definitely the doing of the genius from the Vaergahl Family. When he spoke with Sir Astarot, he found out from him that the genius' name was Jacob Vaergahl, the same as the one he just heard.
After the name sounded in his head, he waited a little longer but nothing happened. He inspected his body to try to find the mental energy that entered his body. From his speculation, he could tell that the mental energy belonged to the consciousness of Jacob Vaergahl. This wasn't Grey's first time with consciousness like these. When he completed the initial process of making his body suitable for the orb, he spoke with the consciousness of the Chaos God.
The consciousness of the Chaos God was left to give the person who inherits the power some guides. Considering Jacob Vaergahl sent word to Sir Astarot, Grey felt like whatever was left of his consciousness is most likely to help assist whoever came for the treasure.
