Blue Glaucus, in-game simply classified as Sea Slug, is a species of gastropod in Abyssrium.
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Blue glaucuses are sea slugs that inhabit the pelagic zones in warm oceans all over the world. They normally swim upside down. They are carnivorous and feed mainly on
Portuguese men o' war, storing its nematocysts. Due this, blue glaucuses can be as, or multiple times as, venomous as Portuguese men o' war.
- In real life, blue glaucuses normally swim upside down but in-game they swim normally.
- Despite being a sea slug, it's classified as a blowfish in-game.