Code-named Puma by Inner Sphere forces who first engaged it, the Adder is a light Clan OmniMech that serves as a direct or an indirect fire-support unit in most of its configurations. The Adder is capable of carrying a relatively heavy weapons payload that can surprise an unsuspecting enemy, even at extreme ranges.

The Adder was designed by Clan Star Adder in preparation for the invasion of the Inner Sphere. First produced in 3010, the formidable Adder was actually designed as an OmniMech capable of emulating the weapons configurations Wolf's Dragoons reported as most common for medium Inner Sphere BattleMechs, the 'Mechs most frequently fielded by Successor State armies. Some of these configurations, including B, C, and D, are still used as of 3050. Despite producing such a formidable design, the Star Adders failed to maintain exclusive possession of the Adder; by 3045, the Adder had become common throughout the Clans. The development of the Adder was tied into the restructuring of the Star Adder's Kappa Galaxy to emulate an Inner Sphere force, to provide a training opponent for other Star Adder units. A number of the main configurations of the Adder were designed specifically for Kappa Galaxy, or were based on intelligence provided by Wolf's Dragoons.
Figure comes with Alpha Strike & Pilot Cards.