D&D Random Encounters for 5E - Underwater

Encounters might be a meeting with a patrol of guards at an old shrine or a familiar looking for aid. It might be an ambush in the wilderness, a stand-off in the city or a monster in the Underdark.
Encounters underwater bring visions of murky seas, vast reefs and dark depths. They might occur in a kelp bed, an underwater cave or by a long-forgotten shipwreck

tools for - dnd5e encounters underwater

level: party size: terrain: sources: type:

combatseamonster

1 Giant Octopus

At a stone arch. There is a half-built cairn with a patch of colourful seaweed (a mass of plankton is drifting into the area)
They are strong swimmers (extra speed)
In a fight they attack anyone who looks like a source of food
Possibly... during the fight a weapon breaks at an unfortunate moment
Difficulty... 200 Medium

combatseamonster

1 Plesiosaurus

At a channel through a coral reef (someone has left a seaweed-covered a shield made from a large shell)
They are are looking for somewhere to die
In a fight they attack whoever looks most dangerous
Possibly... they have a Cloak of the Manta Ray
Difficulty... 450 Deadly

combatshark

1 Reef Shark

At a statue surrounded by mud (close by is an area of dying seaweed)
They are investigating an unusual type of seaweed
In a fight they attack whoever is largest
Possibly... during the fight a non-combatant stumbles into the area
Difficulty... 100 Easy

combatseamonster

1 Giant Octopus

At an eerie monument (which is protected by a swarm of crustaceans)
They are watching a cave mouth
In a fight they run away as fast as they can if things go badly
Possibly... they have an Eversmoking Bottle
Difficulty... 200 Medium

combat

1 Killer Whale

At a patch of dead coral surrounded by debris (cloud of inky black darkness)
They are telepathic
In a fight they attack whoever looks most dangerous
Possibly... they have 2d4 waterproof ceramic and glass lanterns capable of working underwater (50 gp each)
Difficulty... 700 Deadly