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Gloomwing Skimmer - AI-generated fantasy Monster

Gloomwing Skimmer

Old pilots say the Gloomwing Skimmer was once a sky-serpent that lost its way in a permanent storm and learned to hunt by reading tides instead of clouds. Naturalists dismiss the tale, but the creature's call carries unnaturally far and sometimes echoes from several directions at once. The skimmer's territorial markings are three pale scratches on a mangrove trunk, usually positioned above the highest recent tide line. Boats that ignore the markings often find their lanterns torn away before the first attack.

Monsters
Large monstrosity · Moderate to high, especially in rain, fog, high tide, or confined waterways · Uncommon regional predator

Gloomwing Skimmer

A storm-hunting mangrove drake that nests above a hidden treasure cache and turns fog, falling debris, lantern glare, and rising water into weapons.
AC16
HP95/95
CRModerate to high, especially in rain, fog, high tide, or confined waterways
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 16 · HP 95 · Moderate to high, especially in rain, fog, high tide, or confined waterways

Gloomwing Skimmer

Large monstrosity (coastal ambusher), unaligned
Armor Class16, natural armor
Hit Points95 (10d10 + 40)
Speed
20 ft.,
Swim 30 ft.,
Fly 60 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterityWisdom
SkillsPerceptionStealthSurvival
Damage Resistances
Lightning damage while it is in heavy rain or standing in water,
Bludgeoning damage from falling debris
Immunities
None
Weaknesses
Its territorial instincts can be exploited with a convincing decoy nest or an offering of valuable reflective objects.
It becomes reckless if a creature touches an egg or tears apart the nest.
It has difficulty judging threats reflected in multiple lanterns or polished surfaces, granting advantage on checks made to deceive it with arranged reflections.
Senses
Darkvision 60 ft.,
Blindsight 10 ft. while touching or flying within 5 feet of heavy rain, fog, or dense vegetation,
Passive Perception 16
Languages
Understands Draconic and Auran but cannot speak,
Uses distinctive warning, challenge, and distress calls
ChallengeModerate to high, especially in rain, fog, high tide, or confined waterways
Proficiency Bonus+3
Passive Perception16
Spell Save DC15
Spell Attack Bonus+7
Storm-Blend Camouflage. The skimmer has advantage on Dexterity (Stealth) checks made in heavy rain, dense fog, or dense mangrove foliage. It can attempt to hide while lightly obscured by rain, mist, or foliage.
Mangrove Acrobat. The skimmer ignores difficult terrain caused by roots, shallow water, hanging vines, and unstable branches. It does not need to spend extra movement to climb natural mangrove surfaces.
Warning Call. The skimmer can use a bonus action to mark a visible creature within 60 feet with a piercing three-note call. Until the end of the skimmer's next turn, the marked creature cannot benefit from being lightly obscured from the skimmer by rain, fog, or foliage.
Canopy Cover. If the skimmer is within 10 feet of a mangrove trunk, branch, or hanging vine, it gains half cover against ranged attacks. It loses this benefit until the start of its next turn after using Gloomwing Burst.
Tide-Sense. The skimmer has advantage on Wisdom (Perception) checks that rely on hearing while it is in rain or fog. It can hear the movement of a creature touching the same tree, boat, root system, or waterway within 60 feet.
Marsh Diver. The skimmer can hold its breath for 30 minutes and can move through water without creating obvious ripples unless it chooses to do so.

Actions

Multiattack. The Gloomwing Skimmer makes two attacks: one with its Beak and one with its Talons, or two attacks with its Harpoon Vine.
Beak. Melee Weapon Attack: to hit, reach 5 ft., one target. Hit: 8 () piercing damage plus 4 () poison damage. If the target is a creature, it must succeed on a Constitution saving throw or be poisoned until the end of its next turn.
Talons. Melee Weapon Attack: to hit, reach 5 ft., one target. Hit: 11 () slashing damage. If the target is Large or smaller, the skimmer can push it up to 10 feet.
Harpoon Vine. Ranged Weapon Attack: to hit, range 30/120 ft., one target. Hit: 9 () piercing damage, and the target is grappled by a barbed vine. The grapple ends if the target uses an action to succeed on a Strength (Athletics) check or if the vine is destroyed. The vine has AC 13, 10 hit points, and immunity to psychic and poison damage. While grappling a creature with this attack, the skimmer cannot use the attack again.
Gloomwing Burst. The skimmer beats its broad wings, creating a shrieking burst of rain, leaves, and loose debris. Each creature within 15 feet of a point the skimmer can see within 60 feet must make a Dexterity saving throw. On a failure, a creature takes 10 () slashing damage and is blinded until the start of the skimmer's next turn. On a success, it takes half damage and is not blinded. The skimmer can then fly up to half its flying speed without provoking opportunity attacks.

Reactions

Canopy Catch. When a creature the skimmer can see falls from a branch, boat, or root within 30 feet, the skimmer beats its wings. The falling creature can reduce its falling distance by up to 20 feet and move up to 10 feet horizontally, landing on a branch, vine, or patch of shallow water if one is available. The skimmer can then fly up to 15 feet.
Role
Mobile ambusher, territorial guardian, environmental controller
Built for
5th-level party of 4 characters

Gear

  • Barbed Harpoon Vine (Natural weapon, 15 gp if harvested intact)A braided vine with a barbed shell hook, used as a hunting line and reinforced with stolen cordage.
  • Stolen Nest Hoard (Treasure cache, Approximately 180 gp in mixed valuables, plus the second hidden cache)A collection of tarnished coins, buckles, broken blades, colored cloth, lantern parts, fishing hooks, and sealed containers stolen from travelers.
  • Second Hidden Cache (Adventure treasure, Variable)The second hidden cache is wedged inside a hollow mangrove root beneath the nest. Its contents depend on the campaign, but the skimmer has added mud, feathers, and shell fragments around it.

Feats

The creature can identify its own stolen nesting objects by scent and vibration.
It can distinguish the sound of a boat's hull, paddle, anchor, and oarlock through dense fog.
It recognizes the Rootmaw Crocodilian's territorial bellow and responds with different calls for challenge, warning, or temporary cooperation.

Notes for the game master

The Gloomwing Skimmer is an original monster designed for a 5th-level party.
When using the environment, falling debris should normally deal 3 (1d6) to 10 (3d6) bludgeoning or slashing damage depending on its size.
Rising water can separate characters, make movement difficult, or turn a safe branch into a submerged escape route.
Reflected lantern light can reveal the skimmer's position if characters angle a shield, polished blade, mirror, or wet metal surface toward the canopy.

Tactics

  1. Opening

    The skimmer begins hidden above the waterline, marking intruders with its warning call before striking the most exposed creature. It opens with Harpoon Vine against a rear-line target, then uses the mangrove canopy to break line of sight.

  2. Mid-fight

    It uses branches and fog for cover, pulls isolated targets into the canopy with Harpoon Vine, and knocks creatures toward deep water with its Talons. It deliberately attacks hanging gear, lanterns, and weak branches to create falling debris and confusion.

  3. End of the fight

    If badly wounded, the skimmer releases its harpoon vine, uses Gloomwing Burst to blind pursuers, and retreats into the highest branches. It fights to defend its eggs, its nest, or a stolen object it considers part of the nest.

  4. Retreat

    The skimmer is territorial rather than murderous. It retreats if its nest is no longer threatened, if its eggs are safe, or if it loses more than half its hit points. If the Rootmaw Crocodilian is also threatened, both creatures may coordinate briefly before separating.

How it fights

Begin from concealment above the largest channel and use the warning call before attacking.
Target characters carrying lanterns, maps, containers, or climbing equipment.
Use Harpoon Vine to pull a target toward a weak branch, falling debris, or deep water.
Circle behind the canopy, using rain and fog to deny clean ranged attacks.
Knock characters out of boats with Talons, then let rising water and the Rootmaw Crocodilian create pressure.
Attack hanging ropes, lanterns, and unsecured packs when a direct attack would expose the skimmer.

Who it attacks first

A character isolated from the group
A character carrying a bright lantern or reflective object
A character climbing toward the nest
A lightly armored spellcaster or archer
Any creature that threatens the eggs, nest, or second hidden cache

Works well with

The Rootmaw Crocodilian can attack creatures knocked from branches or pulled into rising water.
The skimmer's Gloomwing Burst can drive characters toward the crocodilian's preferred channels.
Reflected lantern light can reveal the skimmer while simultaneously creating glare that the Rootmaw Crocodilian ignores.
The two creatures may briefly cooperate when threatened, with the crocodilian blocking escape routes below and the skimmer harassing characters above.

How to beat it

Bright, steady illumination that does not flicker or reflect directly into its eyes reduces the effectiveness of its concealment.
Cutting or burning the Harpoon Vine frees a grappled creature.
Characters who spread out deny the skimmer an easy target for Gloomwing Burst.
Readied ranged attacks can punish its exposed dives between branches.
Calm negotiation, an offering of fish, or returning stolen nesting material may end the encounter without combat.

Ways to avoid a fight

Characters can present fish, shellfish, or another fresh offering and retreat from the nest.
A character can imitate the skimmer's warning call with a successful DC 15 Wisdom (Animal Handling) or Charisma (Performance) check, causing it to pause and investigate.
Returning stolen gear to the nest grants advantage on a group Charisma (Animal Handling) check to drive the skimmer away peacefully.
Characters can wait for the tide to fall, reducing the water hazard and making the cache easier to retrieve without entering the canopy.
A character can create a false nest from rope, cloth, and reflective scraps, then lure the skimmer away with a successful DC 16 Intelligence (Nature) or Wisdom (Survival) check.

Ecology

A large, long-winged marsh predator with charcoal feathers, slate-blue scales along its neck, and pale membranes that flash silver in rain. Its eyes glow amber behind a bony brow ridge. A fan of sensory filaments surrounds its beak, allowing it to feel vibrations through mist and falling water. Its tail ends in hooked feathers that resemble mangrove roots.

Behavior

The Gloomwing Skimmer is observant, possessive, and highly sensitive to changes in weather. It hunts during rain squalls, fog, and low light, when its dark wings blend with the canopy. It gives a three-note rasping call before attacking. Locals recognize the call as a warning that boats should stop moving, extinguish bright lamps, and wait for visibility to improve. The skimmer usually prefers intimidation and theft over a prolonged fight.

How it lives

The skimmer nests in the highest fork of the largest mangrove trees, where wind and water keep most predators away. It eats fish, monitor lizards, snakes, marsh birds, and occasionally humanoids traveling alone. It steals bright, durable objects for its nest, especially buckles, lantern parts, coins, blades, rope fittings, and scraps of colored cloth. Its droppings and discarded feathers enrich the shallow pools below the nesting tree, attracting fish and smaller reptiles.

Lair

The skimmer's lair is a massive mangrove crown above a tidal channel. Three thick branches form a platform of woven roots, rope, sailcloth, feathers, and stolen gear. The second hidden cache lies in a hollow root below the nest, reachable from the water or by descending through the tangled branches. At high tide, water rises several feet around the trunk, making the cache easier to reach but increasing the danger of falling.

Habitat
Mangrove waterways, tidal channels, flooded forest, coastal swamps, tropical islands, and rain-lashed estuaries.

Signs that it is near

Three pale claw marks above the highest tide line on a mangrove trunk
Fish scales and bright scraps of metal caught in upper branches
A distant three-note rasping call before storms
Boats found with lanterns torn away or ropes cut
Large shadows moving across the water during rain squalls

Tags

mangrove,
flying predator,
ambusher,
territorial,
storm hunter,
treasure guardian,
Davania,
Mystara,
Green Islands

Lore

Old pilots say the Gloomwing Skimmer was once a sky-serpent that lost its way in a permanent storm and learned to hunt by reading tides instead of clouds. Naturalists dismiss the tale, but the creature's call carries unnaturally far and sometimes echoes from several directions at once. The skimmer's territorial markings are three pale scratches on a mangrove trunk, usually positioned above the highest recent tide line. Boats that ignore the markings often find their lanterns torn away before the first attack.

What drives it

Protect its nest, eggs, and hoard while driving intruders away from its hunting territory. It seeks bright objects, fresh fish, and safe high branches more than it seeks slaughter.

After the fight

If defeated, the skimmer's warning call ceases and local boaters cautiously approach the area. The Rootmaw Crocodilian may claim the lower waterways, while scavengers begin dismantling the nest. If spared or driven away, the creature remembers the intruders and may return during a later storm, either hostile or strangely respectful if its cache was left untouched.

“Naturalists dismiss the tale, but the creature's call carries unnaturally far and sometimes echoes from several directions at once.”
From its lore

Variants

Lanternback Strix: Replace Gloomwing Burst with a blinding lantern-glow that deals radiant damage and briefly dazzles creatures.
Tide-Screech Drake: Increase its Strength to 20, give it a 30-foot swim speed, and replace Beak poison damage with thunder damage from its concussive call.
Mated Pair: Use two skimmers with 70 hit points each. They share a warning call and alternate Harpoon Vine attacks while defending the nest.
Juvenile Skimmer: Medium size, 45 hit points, challenge 2, fly speed 40 feet, and no Gloomwing Burst.

Hooks

Plot hooks

A local ferryman asks the characters to investigate why the warning call has sounded every night for a week, unaware that something has disturbed the second cache.
The skimmer has stolen a ceremonial lantern, navigation chart, or family heirloom and woven it into the nest.
The Rootmaw Crocodilian and Gloomwing Skimmer have begun cooperating unusually often, suggesting that a larger predator or supernatural force is entering the waterways.
A hidden cache contains evidence that an old expedition survived the Green Islands but never returned home.
A rival treasure hunter offers to distract the skimmer while the characters retrieve the cache, but plans to keep the most valuable item.

How to use it

Place the second hidden cache beneath or inside the largest mangrove tree in the area. The skimmer's nest should be visible only after characters climb, fly, or reach a high branch.
Let the players choose whether to confront the skimmer, distract it with food or a decoy, steal the cache during a squall, or retreat until weather and visibility improve.
During heavy rain, increase the difficulty of Wisdom (Perception) checks to spot the skimmer by 2, but allow characters to use thunder and wind as cover for movement.
If the Rootmaw Crocodilian is nearby, the creatures compete over prey and basking platforms. They may attack each other until the characters disturb the cache or threaten both animals.
Use the encounter as a vertical battle across roots, branches, hanging vines, half-submerged platforms, and narrow boats rather than as a flat fight.

Treasure

The second hidden cache beneath the nesting tree contains valuables determined by the campaign.
The nest contains 180 gp in mixed coins, six semiprecious stones worth 25 gp each, a silver lantern worth 50 gp, a waterproof map case, and a damaged but repairable +1 dagger.
The stolen gear includes useful rope, fishing tools, sealed oil flasks, navigation instruments, and several objects recognizable to local families.

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