To create a route that Chrysanthemum and her people could use to move around Somuli at their own pace undetected, Kyran would need to create a place similar to the Spirit World.
Creating a pseudo-world requires a powerful relic that will act as its core. This core will then be responsible for ensuring that the circulation and replenishment of magic energy in that world is possible. After all, without magic energy, that pseudo-world can not produce natural resources with internal magic energy.
Most importantly, Beings like Spirits, who are born from the purest energy from different forms of natural resources, can only survive in places that have adequate magic energy. As a matter of fact, it is also impossible for mages to survive for long in a place that can not produce its own magic energy.
When Caelan created the Spirit World, White Lily offered her tiara as its core. And up to this day, that tiara remained the Spirit World's core.