These images are part of the set which make up Oak's abilities. 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.
Appears on these pages
— When Oak uses Shield on an ally, all of his negative effects are removed, and he is immune to...
— Oak grants a shield to a target, making them immune to damage. Purity — When Oak uses Shield...
Actually his nickname IS The Oak. Quote: "they gave him a new name: The Oak" --- Plantgirl...