The Near-Earth Xenothreat Universal Satellite (NEXUS) Defense Grid is a network of specialized satellites designed by Michael O'Connell and Paul Jennings, with logistical assistance from Tek and Espilon. The satellites, reverse-engineered from the shielding technology of the Technax Armada, create a field of debilitating energy around the Earth, preventing any spacecraft from approaching or leaving the planet without clearance from the League of Salvation.