AllianceMax Level 5
Defense Citadel
A sector-wide fortification that projects defensive fields and command authority across an entire star system cluster. The most powerful defensive structure in the game — requires alliance-level coordination to build and maintain.
Effect per Level
| Level | Effect (cumulative) |
|---|---|
| 1 | +20% sector defense bonus, +0.1 alliance member defense aura |
| 5 | +100% sector defense bonus, +0.5 alliance member defense aura |
Cost Scaling
| Level | metal | crystal | gas | Time |
|---|---|---|---|---|
| 1 | 80,000 | 60,000 | 25,000 | 48h |
| 5 | 6,480,000 | 4,860,000 | 2,025,000 | 1875h |
Formula: base_cost × 3^(level−1)
Requirements
Strategy Tips
Upgrade Metal Mines early — metal is needed for every construction. Aim for level 10+ before branching out.
Lore
Empires rise and fall. A Citadel-held sector simply does not fall. It is the last argument in any negotiation.