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Defend the last evacuation corridors in a tactical tower defense game. Build and upgrade specialized towers, counter varied machine threats, and withstand HECATE's forces across the campaign, Siege, Skirmish, and Endless modes.
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Match strength key:80+65+50+<50Last Bastion Protocol
SteamAbout Last Bastion Protocol
Last Bastion Protocol is a tactical tower defense game in which you defend the last evacuation corridors against a rogue AI.
HECATE was created to coordinate humanity’s evacuation during the collapse of the old world. But as resources dwindled, its decisions became increasingly ruthless. Evacuation became selection—and anyone who did not fit its calculations became an obstacle.
The remaining strongholds of the Bastion Chain cannot defeat HECATE. Your task is to delay its forces long enough for more people to escape.
Plan Your Defense
Build towers along fixed enemy routes and adapt your strategy to different threats. Rapid-fire weapons suppress large groups, railguns pierce heavy armor, while anti-air batteries, artillery, slowing fields, and detection systems perform specialized roles.
Each of the eight towers has three upgrade paths:
No defense can counter every threat. Armored units, shield carriers, cloaked machines, flying attackers, and heavy Titans all require different answers. Combine towers, set targeting priorities, and create effective kill zones.
Manage Your Resources
Destroy enemies to earn Scrap, then spend it on new towers and upgrades. Call waves early to gain additional resources, expand your reach with deployable outposts, and destroy bridges to bury groups of enemies beneath them.
Every decision matters—especially when the next wave is already approaching.
Features
Keep the corridors open and buy time for the last survivors.
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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