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:

• Core improves its basic performance.

• Alpha unlocks a specialized tactical role.

• Beta offers an alternative role with different abilities and synergies.

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

• A 15-mission story campaign

• 15 handcrafted battlefields

• 8 tower types with three upgrade paths each

• 7 enemy classes with armor, shields, stealth, flight, and other abilities

• Siege Mode with 50 increasingly difficult waves

• Skirmish Mode with 100 waves

• Endless Mode

• 5 difficulty levels

• Multiple targeting priorities

• Deployable outposts and destructible bridges

• A map editor with local import and export

• Achievements, campaign progression, a tutorial, and an integrated field manual

• Mouse and keyboard or gamepad controls

Keep the corridors open and buy time for the last survivors.