Old Faithful

 General: 

Old Faithful is the only confirmed Omega class cryptid that has never been directly seen. Confirmation of its existence was done through satellite imagining. Imaging suggests Old faithful is a massive creature lying dormant beneath the Yellowstone caldera. Its breath is presumed to cause the eruptions of the geyser - Old faithful, hence its predictable regularity.

 Description: 

Since no visual description of Old Faithful exists, we can only predict at its capabilities. It is presumed that the awakening of Old Faithful would cause the eruption of the Yellowstone volcano and therefore the collapse of North American society.