Ardanium II was a chemical with similar properties as the mineral Ardanium. It grew stronger in the presence of radiation, although by a much smaller factor than Ardanium, making it safer to use for smaller energy sources.
Ardanium II energy was a resource in Star Wars Galaxies that could only be obtained from killed Sith Shadows. Crafters needed it to build several objects for use in the ongoing defense of Aurilia. It was removed from the game, along with the whole village of Aurilia, in November 2005.