Arc Towers and Arc Batteries are the Helghast's secret defenses of Pyrrhus. They are powered by the unique and powerful element only found on Helghan, petrusite. They create large arcs of electricity, and anything that comes in contact with the arc is destroyed. Mobile Arc Towers are introduced during the Blood Meridian section of Killzone 2. Sev and Garza are ordered to destroy that Arc Tower by Captain Narville, as it is stopping reinforcements from landing in the area. In the final mission, Visari Palace, Alpha Squad is ordered to blow up four towers that control the power supply for an Arc Battery. This is a 300 meter high structure that is able to destroy an ISA Cruiser in one blast.