The Wizard Thrymgjor, is a being powerful enough to summon dangerous monsters from the depths of the underworld and is often attributed to wielding the darkness which disturbs the balance of the world. He was sent by Rouge Goddess Rabellu to conquer Heijend in her name, however in during his conquest, he was sealed by the Sages of Heijend and since been bidding his time in a cave once called the Lifeline of Heijend. However these sages could not seal his powers and kept guardians instead protecting the location of the sealed vessels of Thrymgjor, when opened can cause Thrymgjor to escape the cave and run rampart in Egonihl.
Despite the strange waters of the lake Sirpel, which was rich in flora and fauna in the past, after the fierce battle have converted in to the pent-up caves that are located on the waterfront with a cliff-rich, high-tide sea-bottom cliffs. The cave of this burp bridge is a typical seawater cave, with its unique artificial feel and mystical aura, a windy place where the dangerous monster Thrymgjor takes the souls of people away. This is known as the use of the missing runes to summon the presence of the dark, and his mighty magical power, which threatened the "equilibrium" of Hellmarsh, that still influences the region.