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Aerialfin

Medium Undead, Neutral Evil


Armor Class 14 (natural armor)

Hit Points 60 (8d8+24)

Speed 20 ft. fly 40 ft.

STR 14 (+2)
DEX 16 (+3)
CON 16 (+3)
INT 8 (-1)
WIS 12 (+1)
CHA 6 (-2)

Saving Throws Con +5

Skills Stealth +6, Perception +4

Condition Immunities poisoned

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 3 (700 XP) Proficiency Bonus +2


Air Swim. The Aerialfin moves through air as if it were water. It uses its fly speed to maneuver through the air, treating it as a medium it can swim through.
Keen Senses. The creature has advantage on Wisdom (Perception) checks relying on sight, hearing, or smell.

Actions

Multiattack. The Aerialfin makes two attacks: a Bite and a Tail Swipe.
Bite. Melee weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6+3) piercing damage.
Tail Swipe. Melee weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 7 (1d8+3) bludgeoning damage. The target must succeed on a DC 12 Strength saving throw or be knocked prone.

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Lore & Description

Appearance

The Aerialfin is a skeletal fish that haunts the skies above shores and salt-sprayed cliffs. Its bones are bleached white, fins ossified into rigid sails that catch the wind. It glides through the air as if it were water, undulating with a sinuous motion, fins gleaming with a pearl-like sheen. When it lunges, it snaps its jaw with toothy remnants, delivering a chilling bite that tastes of brine. It can dive through cloud banks as if entering kelp forests, and its presence portends storms.

Behavior & Origins

Long ago, a reef-dweller of legendary hunger fell to a necromantic storm that corrupted water-borne life into wind-born dread. The Aerialfin roams coastal air, hunting sailors and gulls, lured by the scent of fear and the whisper of lost ships. Its skeletal frame can drift along currents of air as easily as a fish glides through water. Only those who respect the sea and the sky can survive its ambushes; the Aerialfin yields fear and misfortune to those who seek to out-sail it.

Monster Image

Aerialfin

Generation Info

Original prompt:
"A skeletal fish that swims through air as if it were water."

Created: Feb 2, 2026
Modified: May 22, 2026

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