Many species of these vermin exist, as summarized on the following table—these variants often have different types of poison or other abilities like translucency or constriction.

Species CR Size HD
Death’s Head Jellyfish 1 Small 2
Crimson Jellyfish 4 Medium 5
Giant Jellyfish 7 Large 9
Sapphire Jellyfish 11 Huge 12
Vampire Jellyfish 14 Gargantuan 16
Whaler jellyfish 17 Colossal 20

The smallest of jellyfish can also form a Jellyfish Swarm.

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