The Warrior is a biological Eridian superweapon lying dormant on Pandora. It resides within a Vault in the northern reaches of the planet, and can be controlled through the use of the Vault Key.
The Warrior is a colossal beast, with four legs, a pair of wings, and a long tail. Sharp teeth and claws give it an overall predatory appearance. It uses its wings to bear it aloft, although it is unclear whether this achieves actual flight or simply aids in leaping. It is quite at home in a lake of lava and will duck under the lava sometimes when it moves to a new location somewhere nearby.
Handsome Jack planned to use the Warrior to cleanse and rebuild Pandora in his own image, under the banner of the Hyperion corporation.