Having originally been constructed during the Forgotten War between the Order of Ixis and the Templar Knights of Aurora, the castle was later improved upon by Nate and Eddy after the two became friends. It's features included defenses intended to keep dark magic wielders like Ixis Naugus out, and a vault where Nate stored his enormous supply of Power Rings. The two friends lived there happily for some time, but their peace came to an end when Naugus arrived in search of Nate's Rings and was pursued by Sonic the Hedgehog and Miles "Tails" Prower. Nate managed to trick Naugus into leaving the fortress after he managed to sneak inside with his foes when Eddy brought them in, but the dark wizard managed to penetrate the defenses again. A battle soon broke out between the three enemies that escalated as each absorbed a massive amount of Rings, transforming them into Ultra Sonic, Hyper Tails, and Ugly Naugus. Despite their efforts, Sonic and Tails were beaten, and Naugus was only beaten when Nate used a hidden Ring to cast him back into the Zone of Silence through his own portal. Unfortunately, the castle was badly destabilized and began to collapse, and Eddy sacrificed his life to safe Nate and the two Freedom Fighters. (StH: #64, #65, #66; CSE)
Sonic later returned to the castle's ruins to pay his respects to Eddy, only to find that Naugus had managed to make his way back from the Zone of Silence and located a supply of unused Rings. A battle ensued between the pair, but Sonic managed to use the Rings to become Ultra Sonic again and sent Naugus back into the Zone of Silence. (FCBD: #5)
- Nate claimed in StH #65 that he and Eddy built the castle, while the CSE indicated that it was built during the Forgotten War. This is most likely the case of an overlooked detail.