When a Phantom first began his journey, he heard a mechanical voice as he absorbed genes, created new abilities, overcame barriers, and so on.
Gradually, each Phantom learned that the source of this voice was their Evolution Tree, which over time took on more and more human characteristics, from tone to personality.
This also happened with Adam's Evolution Tree, which had long ceased to be a mysterious force at the center of his inner space and had become his friend.
To some extent, the same was true of the Path Construct.
But when a Phantom became strong enough to travel to distant parts of the Tarnished Lands or other territories of comparable strength, he might encounter something new.
The Ancient Voice.
When Adam fought against Anelez and later against Erada, who intervened in their duel, he also heard the Ancient Voice for the first time. It acted as an invisible judge who set the rules and directed the proceedings.
