Erubethil's Hibernal Den

This is the inner place where the Arcalum's Light is the strongest & being harvested. The light of Arcalum is actually dim and glows blue. It's an orbs of light that emerging from the bottom of a lake. It has the same properties of the light of the mushroom in the shadow land, so it can penetrate the shadow even though the individual glow of the orb is dim. It also produce a magical energy that makes the environment become fertile.

1 pg: the lake guardians & relevant staffs
2 pg: School Ground