"A modified AT-AT, the Elite AT-AT was armed with thicker and darker armor, and heavier laser cannons. It was piloted by an elite vehicle crew who were among the best pilots in the galactic empire. The vehicle had built-in saws in its legs, making it near-impossible to
take down by a cable. The only weapon that could take it down was an ion explosive." -Wookipedia (and presumably the in game description)
Strike fear into the rebel scum with the empire's-greatest-weapon-that-only-appeared-twice, I mean come on, even the tie phantom made more appearances then this!