Tree of Aeons 4: An Isekai LitRPG Adventure

Aeon attempts to find the origins of the demons, and ventures into the other realms through the void sea.
Join Aeon and the Order as he builds an institution able to protect their own worlds, and take the fight back to the demon controlled worlds.
Book four of an epic reincarnation/Isekai LitRPG story about a man who becomes a tree, growing and progressing throughout the ages in an eternal conflict against a demon incursion.