Planetary fortress

The planetary fortress is an upgrade to the terran command center.

Overview
The number of command centers deployed in combat zones drove the development of standard schematics to upgrade them into a dedicated military role. One variant was the planetary fortress. The Ares planetary fortress entered service following the and featured twin Ibiks cannon and heavier armor.

Structures similar to orbital commands and planetary fortresses were in use by the Kel-Morian Combine by 2502.

Game Unit
Planetary fortresses are useful for holding onto high-risk expansions such as high-yield mineral nodes. Combining the fortress's formidable attack with constant repair by the SCVs it protects mean that a planetary fortress can hold off enemy attacks for quite some time. The planetary fortress' splash damage does not affect friendly units. The fortress may not lift off, or be converted to a command center or orbital command.

Wings of Liberty
In StarCraft II: Wings of Liberty, access to planetary fortresses is unlocked via 10 zerg research points and at the cost of perdition turrets.

In the Wings of Liberty single-player campaign, planetary fortresses must still be upgraded from existing command centers, unlike their orbital command counterparts.

Known Types

 * Mercenary fortress