The prototype AS piloted by Sousuke under the auspices of MITHRIL. It is loaded with a black technology-based Lambda Driver, and judging from its external design is probably the successor to the M9 Gernsback. The Arbalest was created by the same person that designed the M9, Bunny Morauta, who was a “Whispered” engineer with MITHRIL.
The potential power that this Arm Slave has contained within its armored shell is simply unfathomable. Since the Arbalest was first piloted by Sousuke in episode 6, it refuses to recognize anyone other than him as its pilot. This experimental model still has numerous bugs to be worked out; for example, it is not yet certain whether the mecha's Lambda Driver is even fully operable or not.
A distinctive feature of the Arbalest is that its face resembles that of a ninja carrying a rolled-up scroll in its mouth.
