Leghugger

The  is a power skill that summons a pet Leghugger that follows you and attacks enemies automatically. After being used for some time, it can "evolve" into a stronger form which carries forward to other instances of the skill. It is exclusive to the Queen and the Sea DLC.

Location
After finding the Fisherman's letter in Prisoners' Quarters, go to Toxic Sewers and look for the Fisherman. He will instruct the player to go to Stilt Village. There, a lore room can be found containing an Elite Armored Shrimp. Once killed, Michel's corpse will drop the, as well as a Leghugger, which forces itself into one of the player's skill slots, causing the previous item to be dropped on the ground. The Leghugger is automatically unlocked with no blueprint or cells required once it's obtained.