Deep Fauna Augments
Three augments come from the creatures of the NauTec ocean biomes.
These creatures always drop their part, and Looting can add one more. Life in the Deep covers where each one spawns. All three parts can also come out of lucky fishing zones (see Fishing).

Abyssal Eyes
Part: Abyssal Organ, one from each Abyssal Maw. The Maw hunts in the Abyssal Trench below Y 40.
Slot: Eyes. Gives you night vision while you are at or below Y 45 (configurable, abyssalEyesDepth). Above that it does nothing, and the effect wears off within about ten seconds of rising past it.
It shares the Eyes slot with the
Guardian Eye.

Photophore Skin
Part: Luminous Membrane, one or two from each Lantern Jelly in the Bioluminescent Grove.
Slot: Body. While you are in water, every living thing within 12 blocks of you glows, and the outline shows through blocks (configurable, photophoreSkinRadius). Out of the water it does nothing.
It takes the Body slot, the same one as flight and the Dolphin Fin.

Vent Carapace
Part: four Chitin Plates, one in each of the four extensions. Each Vent Crawler in the Hydrothermal Vents drops one to three. Every extension holding a plate needs its own Claw Robot Arm and its own 25 AP beam (see Augmentation Station).
Slot: Head or Body. Adds 4 armor and 50% knockback resistance, and fire burns you for half as long. Put it in the Head slot to keep the Body slot for something else. A second carapace in the other slot adds nothing.