The Metal Gear EXCELSUS is a giant Metal Gear controled by Senator Armstrong. It serves as part of the final boss in Metal Gear Rising; Revengence.
When SOP and the Patriots fell following Liquid Ocelot's Insurrection, PMCs acted on the development of what had been previously suppressed cyborg technology. The result was an abundance of cyborgs in the armies of PMCs. Due to the advantage of cyborgs capable of making decisions like other humans, the small unmanned gears such as the Gekko units were generating less favor in regards to urban combat. In response, AT Corp did a 180-degree turn and returned to develop a larger UG capable of overpowering cyborgs and tearing a path through urban terrain using its sheer size. The result was a new Metal Gear codenamed "EXCELSUS", meaning "high" or "lofty," as well as being a species name of the Apatosaurus dinosaur. The vehicle was not armed with a nuclear weapon, instead being designed for the purpose of asymmetrical warfare in light of cyborg development. Although initially designed to be a UG, the final design required a pilot.
Unlike other Metal Gears, its development was not top-secret, even being the basis of several news reports, causing some to speculate whether they could be sold. Even though it lacked nuclear armaments, it was still referred to as a Metal Gear, primarily because it was redefined as being a large-scale weapon to differentiate it from UG-class walkers, due to nuclear deterrence becoming obsolete and people preferring weapons that could actually kill other people.
In 2018, Raiden fought against EXCELSUS, with Colorado senator Steven Armstrong piloting it. It bore Desperado's logo on the mech's frame, as Armstrong had intended to frame Desperado with the attack on the Shabhazabad Air Base in Pakistan as part of his plot, as well as implicate either the ISI of Pakistan or terrorists from an OPEC nation as being involved. Doktor speculated that, had Armstrong succeeded in his plot, that "herds" of EXCELSUS will overrun the FATA territories. Raiden managed to defeat it by cutting off its front legs, and then exchanging blows with one of its retractable blades after lifting it away from the pit, before cutting up and throwing the giant blade at the head. What remained of EXCELSUS was further destroyed when Armstrong emerged from its cockpit and used his nanomachines to engage Raiden in hand-to-hand combat on top of and around the wreck.
Metal Gear Solid: Portable Ops
Metal Gear Solid: Peace Walker
Metal Gear Solid V: Ground Zeroes
Metal Gear Solid V: The Phantom Pain
Metal Gear 2: Solid Snake
Metal Gear Solid
Metal Gear Solid 2: Sons of the Liberty
Metal Gear Solid 4: Guns of the Patriots
Metal Gear Rising: Revengeance