The peak powerhouses in Terra were only at Zombie Overlord and Evolver Overlord, not due to a lack of talent or resources, but merely the limits of the zombie virus itself.
However, the Apocalypse Principle that Zayne possessed was more than capable of letting the zombie virus evolve and advance further than its current limit.
Of course, Zayne wasn't that interested in it, and he didn't want to cause any unforeseen variables, especially when the Monthly Apocalypse World Update was this close.
He had already collected the zombie virus of this world and introduced it into a Modern World he had captured in the train survival universe before, isolating it inside that World Globe.
If he ever needed to advance his Evolver Path, he could just experiment safely in isolation without letting it affect the Main World. Anyway, that was the purpose of having those World Globes and the Creation Sovereignty.
