One of the EDF's secret super-weapons in case of a new Ravager invasion, the Proteus is second only to a Walking Fortress in terms of size at over 20 metres tall, and has immense firepower at its disposal. The huge bipedal vehicle's primary armament is two powerful Buster Cannons in turrets where its arms would be, and it also possesses a multi-missile launcher for dealing with swarms of weaker enemies mounted under the cockpit. In spite of its awesome size, the Proteus is still capable of jumping, though it lacks the thrusters of a BM03 Vegalta and cannot hover.