First used on the EXT-4D Exterminator, the Star Leagues's finest achievement in stealth systems consists of several sub-systems that combine to mask a 'Mechs presence on the battlefield. The system maks a hidden 'Mech as good as invisible. Only Inner Sphere 'Mechs con mount this system; the Clans find such systems dishonorable, and stopped reaseaching them more than a century ago.

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