The amount of work spent on the strengthening of the Empire gives You the chance to build a Planetary Defence. Planetary defense - the modern solution for all technological sectors of the Empire. Additionally, Bunker with the improvement of its activity strengthens the design of all defensive structures from Rocket launchers to Plasma guns.

+3% to armour of defensive structure per level.
Ability to construct Planetary Defence at 8th level.
+50% to shields, attack and structure of Planetary defense from 10th level.
From the 10th level, it is possible to build a second Planetary defense.