Guardian

Guardians were biomechanical constructs built by the Eridians for varying purposes.

Biology
Due to their synthetic nature, their physicality varied depending on their role and where they were located.

In rare cases, Guardians were known to be able to talk. The only known talking Guardians were The Watcher, The Overseer and Scourge.

History
Patricia Tannis was forced to abandon a dig site in the Dahl Headlands when her team quit, claiming to have seen "ghosts, or Bigfoot, or something". Tannis sent the Gen 1 Vault Hunters to collect an Eridian elemental artifact from this dig site, to which they discovered that these 'ghosts' were in fact Guardians.

Many Guardians were found protecting the Vault of the Destroyer, and fighting the Crimson Lance who sought to enter.

Statues of Guardians could be found in the Vault of the Warrior, however no living Guardians seemed to be present.