After the defeat of the Locust Horde, Skorge, the high priest of the Kantus monks, used the awakened Riftworm to destroy Sera's cities on the surface. On his personal Hydra, Skorge led the Riftworm to Tollen and Montevado, destroying the cities. During Operation: Hollow Storm, Skorge, atop his Hydra, led the Riftworm to Ilima, sinking it too and it was first seen by Delta Squad before it led the Riftworm to Ilima. After the death of the Riftworm and the attack on the Queen’s palace, Skorge attacked the retreating Gears, following Delta-One who were on Reavers to the surface. The Hydra and Skorge chased Delta until Delta used the Reavers machine guns and rocket launchers to destroy the Hydra, which also killed Skorge.