This article may contain details about material that does not exist in the official SlugTerra canon.
The Glowbyss slug is a new slug introduced in Slugterra: Slug It Out 2.
Glowbyss enters a bioluminescent state that deals burst damage to the opponent.
In protoform, it looks like a green-black Bubbaleone with a light filament like an anglerfish. In velocity, it transforms into a green-black anglerfish that emits a white light from its body to cause damage to the opponent.
In its megamorph protoform, the angler is gone and is instead replaced with several spikes on its forehead and back that have bioluminescent spots. Its velocimorph form also has these changes, and its spots are noticeably brighter.