Pet Finder Tower

The Pet Finder tower was in the centre of the Jaakkon city (but was moved to a barren wasteland following the Endgamer Arc) and houses a giant light Crystal which protects Jaakkon from darkness teleporting in it. It also means that the light void master (who has to stay with the crystal or he will die) has a secret house inside, guarded by infinity creatures, which is why no-one has ever managed to find him. The Pet Finder Tower was later incorporated into the much larger Jaakkon Tower.