Perimeter Defense
From Alpha Centauri Wiki
| Perimeter Defense | |
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| Mineral rows | 5 |
| Maintenance | 0 |
| Requires | Doctrine: Loyalty |
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Increases defense multiplier of base to one against ground attacks. This effectively increases defensive bonus by +75% (or +175% when combined with a Tachyon Field). Defense bonus does not apply against Psi Attacks. Also prevents population loss if the last defender is destroyed.
