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:

combatseamonster

1 Giant Octopus

At a deep trench (it is disguised by a hallucinatory terrain)
They are telepathic
In a fight they run and hide if things go badly
Possibly... during the fight a section of floor or ground gives way
Difficulty... 200 Medium

combat

1 Killer Whale

At a smooth rock (near an area of open water)
They are a shapechanger
In a fight they attack whoever is nearest
Possibly... during the fight someone sees an omen or portent
Difficulty... 700 Deadly

combat

2 Giant Octopi

At a barren slope (nearby is a patch of golden coral)
They are watching a cave mouth
In a fight they attack whoever is causing them the most pain
Possibly... they have 1d3 flasks of alchemist's fire
Difficulty... 600.0 Deadly

combat

1 Merrow

At a wide tunnel entrance and a kelp garden (nearby is a bed of damaged seaweed)
They are destroying something
In a fight they combine ranged attacks at smaller foes
Possibly... they have a Potion of Gaseous Form
Difficulty... 450 Deadly

combatseamonster

1 Merrow

At a wide hole near a shrine to a power of nature (close by is a damaged seaweed garden)
They are adapted to darkness
In a fight they combine ranged attacks at the foes with least armor
Possibly... they have a Trident of Fish Command
Difficulty... 450 Deadly

combat

1 Giant Octopus

At an area of sea anemones (the area has a programmed illusion involving sahuagin)
They are in need of help
In a fight they fight to the bitter end
Possibly... they have a Ring of Warmth
Difficulty... 200 Medium

combat

1 Swarm of Quippers

At a sea tunnel entrance (nearby is a statue)
They are hiding from a nearby light source
In a fight they act as if something else is guiding them - they focus on a particular race
Difficulty... 200 Medium

combatseamonster

1 Giant Octopus

At a bed of colourful sea anemones. There is an algae-covered rock with a concealed sea cave entrance (swarm of inquisitive bright fish, attracted to any light)
They are adapted to darkness
In a fight they run away as fast as they can if things go badly
Possibly... they have Daern's Instant Fortress
Difficulty... 200 Medium

combat

1 Merrow

At a column of stone (the marine wildlife has disappeared)
They are gathering shells
In a fight they prefer to capture their foes
Possibly... during the fight scavengers are attracted by the fighting
Difficulty... 450 Deadly

combatsnake

A nest (group) of snakes

3 Constrictor Snakes
1 Giant Poisonous Snake

At a kelp garden near a column of stone (an inky cloud covers the area)
They are strong swimmers (extra speed)
In a fight they quickly retreat and try attacking again from ambush
Possibly... they have a suit of Mariner's Armor
Difficulty... 400 Deadly