Transcendent Shadow Undead - When Evan saw these words he was not surprised because he had already got information about it from the Rune of Evolution.
After becoming a Rank One Core Evolver, people have to turn their world essence into conceptual energy if they want to evolve further. Without transforming their world essence into conceptual energy and creating their own Domain, it is impossible for people to become a Rank Two Core Evolver.
Evan's shadow undeads were able to become Rank One Core Evolvers without any problem solely because of the Rune Of Evolution. But even the Rune Of Evolution couldn't help his shadow undeads if they wanted to advance further. After all, people have to comprehend the conceptual energy that they think is best for them by themselves and create a suitable domain.
Without a core, it is impossible for people to create their domain or zone because the domain and zone of the evolvers originate from their cores.