5e D&D Combat Encounters - Underwater

Combat Encounters include creature groups, hazards and lone npcs. Maybe a lost lizardfolk, a forest fire or a talkative druid
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:

combat

1 Sea Hag

At an area of dense kelp (it is protected by a sea fey)
They are foraging for seaweed
In a fight they surrender if things go badly
Difficulty... 450 Deadly

combatseamonster

1 Merrow

At a seaweed bed (the area is touched by druidic magic)
They are gathering shells
In a fight they avoid a particular race
Difficulty... 450 Deadly

combat

1 Giant Octopus

At an overgrown sea cave entrance (by a skeleton of a large sea monster)
They are a shapechanger
In a fight they attack whoever is causing them the most pain
Possibly... they have furs and pelts of arctic beasts (100 gp)
Difficulty... 200 Medium

combatseamonster

1 Plesiosaurus

At an area of living coral. There is a patch of colourful kelp with an edible seaweed garden (there is a mass of rotting bodies chained together)
They are playing with an item - bronze bell
In a fight they attack whoever looks most dangerous
Difficulty... 450 Deadly

combat

2 Swarms of Quippers

At a patch of dead coral surrounded by sand (there is a large shoal of jellyfish in the area)
They are strong swimmers (extra speed)
In a fight they attack whoever is nearest
Possibly... during the fight a swarm of snakes is attracted by the smell of blood
Difficulty... 600.0 Deadly

combat

1 Sea Hag

At a patch of algae and a patch of red seaweed (there is a periodic booming noise)
They are telepathic
In a fight they focus on foes attempting to hide
Possibly... they have a Helm of Telepathy
Difficulty... 450 Deadly

combatseamonster

1 Merrow

At an abandoned line of statues (the area is in the area of a forbiddance spell)
They are are looking for a new home or lair
In a fight they combine ranged attacks at the most visible foes
Possibly... they have alchemist's supplies
Difficulty... 450 Deadly

combat

1 Merrow

At an area of living coral and a patch of orange seaweed (nearby is the fresh corpse of a monster)
They are investigating an unusual type of seaweed
In a fight they used ranged attacks and maintain their distance if possible
Possibly... they have a Bead of Force
Difficulty... 450 Deadly

combat

1 Killer Whale

At a sandy surface on coral (which is associated with a power of vengeance)
They are are looking for a mate
In a fight they attack whoever is nearest
Possibly... during the fight a wall, tree or building starts to collapse or fall
Difficulty... 700 Deadly

combatwater

3 Mud Mephits (Monster Manual p.216)

At a few underwater cave entrances. There is a mound of dead seaweed with a patch of dead coral (nearby is a carved underwater cave)
They are foraging for seaweed
In a fight they keep away from the most heavily armored foes
Possibly... during the fight a greater power sends aid to a faithful servant
Difficulty... 300 Hard