Petrusite is a powerful element made from a unique form of Higg Boson molecules only found on the planet Helghan and in a few of its fauna. In Helghan's early years, it was used to supply Vekta and Helghan with energy. But when Scolar Visari gained power, he used Petrusite to create weaponry during the Second Extrasolar War. The Arc Tower, VC5 Arc Gun, and even more weapons are powered by this source. It was widely used and was a large part of the Helghast war machine when defending Helghan, as it powered their Arc Cannons which had stalled the ISA fleet for some time before breaking through. They process the petrusite using refineries, using seawater to cool the reactor and refine the petrusite.