As the Vault Hunters approach 5H4D0W-TP after entering Deck 13.5, 5H4D0W-TP summons Claptrap's Consciousness and offers him the option of integration to ensure the destruction of Claptrap's enemies, an offer that is refused. Resigning to the fact that Claptrap will die no matter what unfolds following this decision, 5H4D0W-TP informs the Vault Hunters that he will splice himself with the H-Source code, thereby gaining the upper hand in their second encounter. Upon splicing with the H-Source, ECLIPSE begins to form around 5H4D0W-TP and boots up as the Vault Hunters express their disbelief.
ECLIPSE is a formidable opponent with a large health pool and dangerous attacks. It additionally has turrets mounted on its body which provide it with even more offensive capabilities, though those can be targetted and destroyed to help mitigate their danger. Bugs, Glitches, and other enemies will spawn during the battle and can be used to provide Second Winds to any Vault Hunter sent into Fight For Your Life.
Once ECLIPSE has been defeated, 5H4D0w-TP will reconfigure itself into the final boss of the DLC, EOS.
- Main article: System Shutdown
- In addition to a small loot pool consisting of a small number of Moonstones and loot of various rarities, ECLIPSE will always drop one glitch weapon of random type.