The Mk.6 Stollenwurm ( ストレンヴルム, Sutorenvurumu?) is the Feldreß deployed by the Alliance. The Mk.6 was developed with the primary objective of defending the Alliance. Due to this reason, it is perfectly adapted to the mountainous plateaus which present in most of the Alliance. Its light weight allows it to utilize its pair of glide wings to execute high mobility combat maneuvers. Similar to the Federacy's M4A3 Vanagandr, the crew must wear an armored skeleton when operating the Mk.6.