MONSTER MASH-UP: The Blubbernimbus

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MONSTER MASH-UP: The Blubbernimbus

(a.k.a. the Wet Blanket of the Skies)

Physical Description:
The Blubbernimbus resembles a grotesque fusion of whale, jellyfish, and stormcloud. Its lower half is glistening blubber, with fins that flap about as if perpetually trying to remember how to swim in mid-air. From its back rises a great translucent sac, like a swollen balloon of storm vapour, constantly leaking drizzle. Thin, trailing tendrils of mucus and static electricity dangle down like the world’s least festive bunting. Its eyes are beady and suspicious, peering out from folds of fat like guilty pickled onions, and its bulk moves with both the majesty of a cloudbank and the grace of a damp sponge being lobbed at a wall.

Imagine if Poseidon sneezed while looking at a zeppelin, and you’re halfway there.


Combat Style

The Blubbernimbus is as subtle as a pub brawl. It lumbers about in the sky until it sees a gathering of mortals beneath it, then:

  • Splish-Splash: Dumps torrents of seawater from its blubber folds, ruining armour polish and picnic sandwiches.

  • Thunder-Burp: Emits a shocking belch that leaves hair standing on end and tempers frayed.

  • Dive-Bellyflop: In moments of inspiration, forgets it can float and attempts to squash enemies under a bellyful of regret.

OSR Stats (B/X Style)

  • Armour Class: 5 [14] (slippery, blubbery, and sparking)

  • Hit Dice: 6 (30 hp, depending how damp you count it)

  • Move: Fly 90’ (30’), Swim 60’ (20’)

  • Attacks: 1 Lightning Belch (2d6), or Bellyflop (3d6, prone)

  • No. Appearing: 1 (mercifully)

  • Morale: 7 (will flee if it spots a rival thunderstorm)

  • Treasure: Mostly ruined; soggy pearls and rusted trinkets clinging to its folds

  • Special:

    • Shocking Damp: Melee attackers take 1 point of damage per strike.

    • Raincloud Aura: 30’ radius of drizzle; ranged attacks suffer -2.

5e Stats

Blubbernimbus
Large monstrosity, chaotic soggy

Armour Class: 14 (rubbery hide)
Hit Points: 76 (9d10+27)
Speed: Fly 40 ft. (hover), swim 30 ft.

STR 16 (+3)
DEX 12 (+1)
CON 17 (+3)
INT 5 (−3)
WIS 10 (+0)
CHA 8 (−1)

Saving Throws: Con +5
Skills: Perception +2
Damage Resistances: lightning, bludgeoning (from non-magical weapons that aren’t very sharp)
Condition Immunities: prone (it always bobs back up like a rubber duck)
Senses: darkvision 60 ft., passive Perception 12
Languages: understands Seagull, ignores all others
Challenge: 5 (1,800 XP)

Traits

  • Cloud Form. Constant drizzle surrounds the creature. Ranged attacks within 30 feet have disadvantage.

  • Electrostatic Slime. Any creature striking the Blubbernimbus with a melee attack takes 3 (1d6) lightning damage.

Actions

  • Thunder-Burp (Recharge 5–6). The Blubbernimbus releases a blast of static. Each creature within 20 feet must make a DC 13 Con save or take 18 (4d8) lightning damage, half on success.

  • Splish-Splash. Ranged Weapon Attack: +5 to hit, range 30 ft., one target. Hit: 9 (2d8) bludgeoning damage and the target must succeed on a DC 12 Dex save or fall prone.

  • Bellyflop. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 14 (3d6+3) bludgeoning damage and the target is grappled (escape DC 14).

Adventure Hooks

  1. The Fisherman’s Misery: A seaside village is trapped in perpetual drizzle thanks to the creature’s sulking presence.

  2. The Sky Regatta: Aristocratic sky-yachts are being ruined by unexpected bellyflops; the PCs must chase the beast away before the nobility riot.

  3. The Cult of Dampness: A sect of druids claim the Blubbernimbus is the divine child of sky and sea; unfortunately, it’s less interested in worship than in squashing sheep.

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