The Denias system is a large system that borders Klingon and Federation space near the Cestus system. It boast nine planets in its system, with 4 of them classified as gas giants. In 2387, the USS Crusader found the remains of the IKV O'klath, USS Nepal, and the USS Fuller in the system destroyed in a multi pronged attack. They would later find the survivors from the attacks on Denias VIII. The Zentradi set up a research facility on the planet, and fled as the Crusader engaged their drone ships. (Star Trek Crusader; Star Trek: Generation Fleet)