Gotoorak.

Early attempts to close the Corespawn rifts were met with failure due to the fierce resistance put up by the Gotoorak apparition. It is clear that these guardians are closely connected to the rifts as the process of closing a gate involves an intricate process of simultaneously wearing Gotoorak down while disrupting the Gate structure to undo both in one fell swoop. The Gotoorak likely wields bizarre forces from beyond the gate and research has been unable to explain any of the workings behind its ruinous capabilites.