BNK3R

The BNK3R is a large Hyperion craft, created to guard Angel. It is a fully-automated assault ship equipped with six turrets and a laser. Overall, BNK-3R is a tough opponent, but a cluster of optics at the front and a large swivel eye underneath offer some readily accessible critical hit spots. The turrets are similarly vulnerable targets.

Handsome Jack refers to the BNK-3R as if it were a stationary placement right up until its encounter, where he reveals that it's actually an aircraft.

Rewards
BNK3R has a chance to drop a class-specific head for each character.

Trivia

 * The number on BNK-3R's intro graphic, 00101010, is binary for 42. The number 42 is "The Answer to the Ultimate Question of Life, the Universe, and Everything" in "The Hitchhiker's Guide to the Galaxy" franchise.
 * According to Inside the Vault: The Art & Design of Borderlands 2, sound designer Joshua Davidson provides BNK-3R's voice. "When you hear BNK-3R taunting you, it's really just me yelling about tea through heavy audio processing."