13 creatures

Name ▲ CR Alignment Size Description
Crab Swarm 4 N Diminutive
Death’s Head Jellyfish 1 N Small
Giant Crab 2 N Medium
Giant Dragonfly Nymph 3 N Small
Giant Jellyfish 7 N Large
Giant Leech 2 N Medium
Giant Mantis Shrimp 9 N Medium
Jellyfish Swarm 6 N Diminutive All but invisible in the water, this foul swarm of fist-sized jellyfish wriggles and writhes, a...
Leech Swarm 4 N Diminutive
Sapphire Jellyfish 11 N Huge
Shark-Eating Crab 7 N Huge
Shipwrecker Crab 13 N Colossal
Trilobite 1/4 N Tiny