Rolf and Trucy's tree house has no fusion monsters in it but it has fusion portals in it. One day Phoenix Wright's adopted daughter Trucy met a son of a sheperd named Rolf. The two fell in love and ran away from home right around the time the fusion invasion started. They ran away to a place called Hokey Pokey Woods where alot of anamials live. Rolf and Trucy needed to find some shelter so they decided to build a treehouse toghter and it is pretty cool. The fusions in here are level 84 makeing the area level 84.
Fusion portals
Fusion Rolf and Trucy