Hydrowerks is a 
Torgue Armor Shield
Its special effect is Electric Eel - While sliding, launch missiles toward nearby enemies. Gain armor at the end of a slide.
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How to Unlock The Legendary Hydrowerks Shield
Shields
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (Murders and Acquisitions) DLC until reaching the Boss MAXXXSUPREMENOOLIVES.
Farm Method:
- Defeat MAXXXSUPREMENOOLIVES to get a chance at the Hydrowerks.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat MAXXXSUPREMENOOLIVES until the Hydrowerks drops.