Full details for the Defense technology, from level 1 to level 4.
| Level | Gold | Industry | Energy | Tech | Effet |
|---|---|---|---|---|---|
| L1 | 3900 | 0 | 0 | 0 | \nFort\n\nLarge Fort\n\nImperial Fort\n\n |
| L2 | 13000 | 0 | 0 | 0 | \nFort\n\nLarge Fort\n\nImperial Fort\n\n |
| L3 | 26000 | 0 | 0 | 0 | \nFort\n\nLarge Fort\n\nImperial Fort\n\n |
| L4 | 52000 | 0 | 0 | 0 | \nFort\n\nLarge Fort\n\nImperial Fort\n\n |