From Halopedia, the Halo wiki
The Artisan harness bears notable design resemblance to the Storm harness.
The Artisan harness is unlockable as an armor permutation for Elite characters in Halo 3, exclusively as part of Season 7: Elite. It was one of a number of Sangheili harnesses intended to appear in Halo Online, prior to the game's cancellation.
List of appearances