ARX-7 Arbalest is the advanced Arm Slave mecha piloted by Sousuke Sagara in the anime series Full Metal Panic!. Developed by Mithril, Arbalest features the cutting-edge Lambda Driver, granting it significant power and versatility in combat. Serving as the protagonist's primary weapon, Arbalest is central to many of the series' intense battles and dramatic moments, embodying both the technological prowess and the strategic importance of Mithril's forces in their fight against various antagonistic organizations.