The Nexus is the third standard boss encountered. It is first seen during a player's first run-through of the Seoul mission.
More than likely to be the first boss to prove a significant challenge to players, the Nexus possesses a myriad of weapons. It has two autocannons capable of gatling gun-level fire rate and a long range energy cannon weapon, which it can either fire aimed at the player or in a rapid-fire saturation attack. It can additionally summon groups of enemies and improve a regular enemy's speed through a laser emitted from the back of the ship. All of these weapons will increase in fire rate as the Nexus takes damage, and it will rapidly take down a ship's health in close range when it is near death. This enemy's weaponry has the same appearance as the "Repeller" and "Whirlwind" autocannons.
Its elite variant is the Median.
| Fortress Destroyer Enemies
Enemies listed in parentheses () following another enemy are the elite form of that enemy. If there is no elite form listed, that means one does not exist or has not yet been added to the game.