Internal Defense Weapon System is a type of system upgrade that gives the ship a capability of fighting off boarders.
| Subsystems | ||||
|---|---|---|---|---|
| Base Game | DLC | |||
| Xsotan Artifacts | Standard | Black Market | Into The Rift | Behemoth Event Series |
 XSTN-K I XSTN-K II XSTN-K II XSTN-K VI XSTN-K V XSTN-K VI XSTN-K VII XSTN-K VIII
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 Battery Booster Object Detector Cargo Extension Energy-To-Shield Converter Engine Booster Generator Subsystem Trading Subsystem Mining Subsystem Hyperspace Booster Radar Booster Scanner Booster Shield Booster Shield Ionizer Stabilizing Mainframe Wiring Tractor Beam Upgrade Turret Control Subsystems Velocity Security Control Bypass Internal Defense Weapons System Hydra Subsystem Shield Reinforcer Transporter Software Hull Polarizer
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 Behemoth Carrier Subsystem Behemoth Civil Subsystem Exploration Booster Behemoth Combat Subsystem
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