These images are part of the set which make up Citadel Upgrades items. They were ripped from the game files. As such they are used under a Fair Use criteria. They belong to GasPoweredGames/Stardock.
There is a good chance that the image name may not correspond exactly to the skill it is associated with. If this is the case, leave a message on the talk page, and it will be fixed.
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While the Citadel is the sturdiest of structures and the target of the enemy team, it can also...