5H4D0W-TP, or simply Shadow-Trap, is the main antagonist of the Pre-Sequel DLC (the) Claptastic Voyage. The boss fight for Shadow-Trap has a few stages and an be pretty tricky running in blind. But for starters, it should be mentioned
The true boss fight takes place in three stages: Shadow-Trap, ECLIPSE, and EOS.
This video by YouTuber "MorninAfterKill" is pretty useful for learning a decent strategy you can take in to the fight.