Obelisk does not move. It is the only Behemoth that has never been observed in motion. It stands in the exact geographic center of Iowa — a perfect vertical spike of dark metal rising 120 meters from a base embedded deep in the bedrock. Its surface is seamless, without visible joints, hatches, or sensor arrays. It reflects no radar, absorbs most visible light, and maintains a surface temperature exactly matching the ambient air at all times, making it nearly invisible to thermal imaging. From a distance it looks like a shadow with no source.

Obelisk's classification as a Behemoth is debated. It has no legs, no locomotion, no apparent function. But it shares characteristics with other Behemoths: self-repair capability (scratches on its surface heal within hours), unknown power source, and pre-collapse origin. Most compellingly, every other Behemoth in Iowa has been observed traveling to Obelisk's location at irregular intervals. They arrive, stand near it for hours or days, and then resume their normal patterns. Palisade's road network converges on it. Leviathan's tunnels spiral around it. Cathedral's signal is strongest when facing it. Obelisk appears to be the hub of whatever the Behemoths are collectively doing.

The area within one kilometer of Obelisk is anomalous. Electronic equipment malfunctions. Compass needles point toward it instead of north. People who spend more than a few hours in its proximity report vivid dreams about machinery and geometric patterns. The ground around its base vibrates at a frequency just below human hearing, producing a persistent sense of unease. Three research expeditions have attempted to study Obelisk up close. All three abandoned their missions within 48 hours, citing equipment failure and 'psychological distress.' Their sensor data was corrupted beyond recovery.