Fortress Keys

Objectives

1. 1Blazing Steel
2. 2Skilled Workflow Optimization Research
3. 3Weapon Heat-Treatment Research
4. 4Brimstone Research
5. 5Mineral Excavation Efficiency Research

Walkthrough

1. 1Use the transporter in Strange Manor to visit Valvegard Garrison (western fortress) first
2. 2Defeat all enemies around Valvegard until the area counter reaches 0%
3. 3Engage the boss Thunder Tank — a heavy tank using close-range charges and missile barrages
4. 4Use the Nature's Snare skill (Level 2) to throw back its projectiles at the boss
5. 5Collect the key from the purple-marked crate after defeating the boss
6. 6Teleport to Aeronautical Research Base (southeastern fortress) using the transporter
7. 7Clear all enemies in the base to reach 0% liberation counter
8. 8Defeat the boss Storm Crusher — a fire tank with similar mechanics to Thunder Tank
9. 9Grab the key from the purple-marked crate
10. 10Travel to Marni's Laboratorium (northern fortress) as your final destination
11. 11Defeat all enemies in the laboratorium
12. 12Battle the boss Dreadnought — a robot boss with dangerous yellow laser attacks
13. 13Collect the final key from the purple-marked crate to complete the quest

Tips

• Valvegard Garrison is surrounded by a blue barrier — you must start there using the transporter
• Complete Valvegard first as it's the most challenging fortress
• Both Thunder Tank and Storm Crusher have similar mechanics — learn the pattern and adapt to Dreadnought
• Use Nature's Snare skill to reflect tank projectiles back at the bosses for massive damage
• Stay mobile during Dreadnought's yellow laser attacks — dodge in circular patterns to avoid damage
• Capture the Dreadnought robot with projectiles to finish it quickly
• Each fortress boss drops one Artifact — collect all three for Chapter 12 progression
• The order of fortress visits doesn't matter — tackle them in any sequence you prefer

NPCs Involved

• Mysterious Man