The Gloom's Maw

A Note on Difficulty

The Abyss is a Level 10 threat in a world where most content sits between Levels 3 and 7. It should feel impossible. If your players treat it like another dungeon crawl, you haven't conveyed the danger properly. When in doubt, make it worse.

Three Narrative Functions

• A source of monsters - creatures emerge from the depths to threaten coastal regions, providing adventure hooks at any level.
• A destination for high-level play - descending into the Abyss represents endgame content for characters who have exhausted safer challenges.
• A consequence engine - contact with abyssal forces (creatures, artifacts, pacts) creates lasting character complications that drive future stories.

Leviathans

Massive sea serpents armored in scales harder than steel. Their eyes glow with bioluminescence visible from leagues away. A full-grown Leviathan can wrap around a galleon and crush it like kindling.

Using Leviathans: These work best as environmental hazards rather than combat encounters. A Leviathan stirring creates underwater currents, whirlpools, and sudden squalls. Fighting one directly should require an entire fleet or divine intervention.

Kraken

Colossal cephalopods with intelligence to match their size. Kraken don't merely attack; they plan, adapt, and hold grudges. Their tentacles can reach the surface from remarkable depths, and their movements disturb weather patterns for miles around.

Using Kraken: Kraken make excellent long-term antagonists. One that notices your party might study them across multiple sessions before striking. They can also be negotiated with, if players have something worth offering.

Merrow

The malevolent merfolk of the deep. Beautiful and terrible in equal measure, Merrow use enchanting voices to lure sailors to their deaths. Their songs can shift tides and currents, making them a threat to ships even when they're not actively hunting.

Using Merrow: Merrow work well as the "face" of the Abyss, the creatures players are most likely to interact with before everything goes wrong. A Merrow envoy might deliver threats, offer bargains, or serve as a guide (for a price).

Charybdis

Not a whirlpool but a creature: a vast, monstrous entity that creates whirlpools as a byproduct of its feeding. Ships caught in Charybdis's pull are dragged down and devoured. Its activity affects ocean currents for hundreds of miles.

Using Charybdis: Charybdis works best as a location-based hazard. Certain sea routes become impassable when Charybdis is active. Navigating around it (or through it) can form the basis of an entire adventure.

Scylla

A many-headed predator of terrible speed and endless hunger. Scylla lurks near the upper reaches of the Trench, snatching sailors from decks before anyone can react. The waters around her lair churn with constant turbulence.

Using Scylla: Scylla is a more traditional monster encounter; she can be fought, driven off, or circumvented. She's useful for establishing that the Trench has layers of danger. Beating Scylla doesn't mean you've conquered the Abyss.

Abyssal Lurkers

Shadowy, amorphous things that blend perfectly with the darkness. Lurkers attach themselves to ship hulls and slowly weaken the structure until it collapses. Victims rarely realize they're under attack until their vessel breaks apart around them.

Using Lurkers: Lurkers create paranoia. Once players know they exist, every creak of the hull becomes suspicious. They're also useful for stranding parties: a ship destroyed by Lurkers leaves survivors floating in Trench-adjacent waters with no easy escape.

The Unnamed

Deeper still, things exist that have never been documented because no one who has seen them has survived to give testimony. As GM, you have full license to invent horrors for the deepest reaches. The only rule: whatever you create should be worse than what came before.

1. Be Native

Creatures born in the Abyss are adapted to its conditions. The pressure is normal. The darkness is home. The cold is comfortable. Abyssal natives don't merely survive the depths; they're empowered by them.

Player characters with abyssal heritage (discuss with your player during character creation) may have limited tolerance for the upper reaches of the Trench, but true deep-diving requires being fully native.

2. Be a Celestial Ruler

King Trystane, the Tempest King, commands all waters. The Trench exists within his domain. He doesn't survive the Abyss; the Abyss exists at his sufferance.

Queen Ashley's divine fire predates the world itself. The darkness cannot extinguish what burned before darkness existed.

These are NPCs, not player options. They represent the absolute ceiling of what's possible.

3. Receive Divine Protection

A mortal can descend if and only if a Celestial being extends their protection. King Trystane can wrap a mortal in his authority over the waters. Queen Ashley's blessing can preserve life in conditions that should be instantly fatal.

This protection is not automatic, not permanent, and not absolute. The Celestial chooses how much to shield their charge. They may provide complete protection or they may let the character experience the full weight of the Abyss while keeping them barely alive.

If protection is withdrawn, the character dies instantly. If the Celestial is incapacitated, protection fails. There is no grace period.

What About Cedric?

Archangel Cedric Gabriel can enter the Trench; he has done so in the past. But he pays a price every time. The Abyss drowns his light, forcing him to expend enormous energy just to maintain his radiance. He emerges diminished, requiring significant recovery time.

If an Archangel actively avoids the Gloom's Maw whenever possible, players should take the hint.

What Doesn't Work

• Magical protection spells - no mortal magic can withstand the pressure and cold.
• Artifacts - nothing crafted by mortal hands can substitute for divine protection.
• Submarines or diving bells - the pressure would crush any vessel instantly.
• Polymorph or shapechanging - assuming an aquatic form doesn't grant abyssal adaptation.
• Deals with non-divine entities - demons, devils, fae, and similar beings cannot grant what they don't possess.
• Clever loopholes - if a player proposes something not covered here, the answer is almost certainly "no."

The Trench exists to be inaccessible through normal means. That's the point.

Before They Go

Make certain players understand the following, out of character:

• They are entirely dependent on whoever brought them. Independence is impossible.
• Their magic will be compromised or useless (see Magic in the Abyss below).
• Survival will carry permanent consequences for their characters.
• This is not a dungeon crawl. Combat solutions are rarely viable.

Get explicit confirmation that they want to proceed. Abyss storylines should never ambush players with consequences they didn't agree to.

The Descent: Four Stages

Describe the descent in stages to build tension:

• The Upper Reaches - light fades. Temperature drops. Familiar sea creatures give way to stranger things. Magic begins to feel sluggish.
• The Middle Depths - complete darkness. Crushing pressure held back only by divine protection. The cold becomes a constant, numbing presence. Characters begin to sense they're being watched.
• The Deep - something shifts. The water feels alive, aware of intruders. Sounds carry wrong. Directions become uncertain. Whatever protection the characters have is clearly straining against forces that want them dead.
• The Abyss Proper - this is as far as most expeditions go. Here, the true denizens dwell. Here, surface creatures are prey. Here, players learn what it means to be insignificant.

What They Experience

Even with divine protection, characters should feel:

• The Weight - a constant pressure that protection holds back but doesn't eliminate. Like being slowly squeezed.
• The Cold - seeping, persistent, reaching past protection to touch bone and soul.
• The Dark - absolute. Light sources work within the protection bubble but illuminate nothing beyond it.
• The Watching - something knows they're here. Many somethings. Players should never feel alone.

Encounters

Traditional combat is rarely appropriate in the Abyss. Characters are outmatched by virtually everything native to the depths. Instead, focus on:

• Evasion - avoiding notice by things too large or too numerous to fight.
• Negotiation - some Abyssal beings can be bargained with. All bargains carry costs.
• Puzzles - ancient ruins, sunken secrets, or navigational challenges that don't require violence.
• Survival - managing limited resources or enduring conditions until they can escape.
• Horror - sometimes the best encounter is simply witnessing something the characters cannot affect in any way.

When combat does occur, weight it heavily against the players. They should win only through sacrifice, cleverness, or outside intervention; never through straightforward application of violence.

Does Not Function At All

• Fire Magic - the Abyss absorbs fire instantly and completely.
• Nature and Druid Magic - there is no natural order here.
• Teleportation and Portals - the Abyss does not release what it holds. Under any circumstances.

Severely Weakened

• Divine Magic (Mortal) - healing spells restore half their normal amount. Other divine magic functions at one spell level lower than cast (minimum cantrip).
• Light Magic - functions within the protection bubble only. Cannot illuminate the surrounding waters. Attracts attention from things drawn to light.

Unpredictable / Dangerous

• Water Magic - unpredictable. The waters here belong to something else. Spells may function normally, function in reverse, or simply fail. Roll a d6: 1-2 normal effect, 3-4 no effect, 5-6 GM's choice of complication.
• Other Elemental Magic - as water magic. The Abyss has its own elements; yours are foreign.
• Arcane Magic - functions but attracts attention. Any spell of 3rd level or higher alerts nearby Abyssal creatures to the caster's presence and location.

Draws Immediate Attention

• Necromancy and Dark Magic - functions normally and draws immediate attention. The Abyss recognizes its own language. Use at your peril.
• Divine Blessings (Celestial) - function normally but create a visible beacon. Everything within a significant radius knows exactly where the blessed character is.

What Still Works

• Physical armor and weapons - non-magical equipment functions exactly as on the surface.
• Physical racial abilities - strength, natural armor, claws, breath weapons all function normally.
• Mundane equipment and skills - if it doesn't require magic, it works.
• Enchanted equipment - may function at reduced effectiveness or not at all (GM discretion based on the nature of the enchantment). The Abyss affects magic, not steel.

Abyssal Native Magic

Creatures native to the Abyss experience the opposite of all restrictions above. Their magic is amplified, casting is effortless, and they suffer no drain. This is their home field.

The Only Exit

Characters leave with whoever brought them down. Teleportation fails. Gate spells fail. Plane shifting fails. The Abyss keeps what enters until the waters release it.

If the characters' guide or protector is killed, incapacitated, or simply chooses to abandon them, they have no way out. Death follows shortly.

Exceptions and Emergency Scenarios

Dramatic exception: A native Abyssal creature could theoretically guide characters to the surface. This should never be free; the creature will want something in return, and Abyssal bargains are never simple.

Emergency: If the party's protector falls unconscious, divine protection may linger for a very short time (your discretion; minutes at most). This creates tension without instant TPK, but players should understand they're on borrowed time.

If King Trystane himself is incapacitated in the Abyss... that's a campaign-defining catastrophe. Figure out what that means for your world.

The Abyss Mark (Permanent)

All survivors develop visible signs of their descent:

• Patches of skin, scale, or fur that are darker, colder, and subtly wrong
• Eyes that flash with abyssal shadow during moments of strong emotion
• A persistent chill that never fully fades, regardless of warmth

These marks are immediately recognizable to anyone familiar with the Abyss. Survivors cannot hide what they've done.

Mechanical Suggestion: Abyss Marks might grant advantage on Intimidation checks against those who recognize them, and disadvantage on social checks with the Order of the Abyssal Watchers or others who distrust contact with the deep.

Magic Sickness (13-Day Recovery)

Upon returning to the surface, characters who rely on magic find their connection severed, then slowly rebuilding.

Days 1-3: Complete Blackout - no access to any magical abilities whatsoever. Spellcasters cannot cast even cantrips. Magical creatures feel fundamentally diminished.

Days 4-13: Gradual Reconnection - magic returns one spell level per day. Day 4: Level 1. Day 5: Level 2. Day 6: Level 3. And so on until Day 13 when full power is restored.

This recovery cannot be shortened by healing magic, rest, or any other means. Deeper descents or longer exposure may extend the initial blackout period.

The Voices (Permanent)

The Abyss remembers everyone who enters. Things that noticed the characters continue to notice them, even after they leave.

Survivors hear whispers in quiet moments: offers of power, promises of restoration, bargains that seem almost reasonable. The voices come most often at night, when defenses are low and the sickness makes the character feel empty.

These whispers are the first overtures of potential Abyssal pacts. They never stop completely. Players should roleplay periodic temptation for as long as the character lives.

Psychological Scars (Choose One)

Beyond mechanical effects, players should select ONE lasting psychological effect. This gives them agency while ensuring consequences feel personal rather than punitive:

• Nightmares about the descent that occasionally disrupt rest
• Discomfort with deep water or being submerged
• Unease in complete darkness (not dim light; true darkness)
• A persistent chill that worsens in cold environments
• Flashbacks triggered by a specific sensory cue (a sound, smell, or sight related to their descent)
• A troubling sense that the darkness felt like home

Work with the player to choose something that creates interesting roleplay without crippling their character's core function.

What the Patron Receives

• Ownership - the character's soul becomes the patron's property, usable as currency in Abyssal politics.
• Sustenance - a constant, passive drain on the character's magical energy feeds the patron indefinitely.
• Service - the patron may call upon the character to perform tasks. Refusal is... complicated.
• Claim - other Abyssal entities must respect the patron's ownership. The character is territory.

What the Character Receives

• Power - abilities granted at the patron's discretion. These may be withdrawn at any time.
• Protection - other Abyssal entities cannot claim or freely harm what belongs to another.
• Silence - the patron is territorial. Other voices fade when one entity holds clear ownership.
• Relief - the magic sickness ends. The emptiness fills. This is often the true temptation.

The "Kind" Patron

Some Abyssal entities treat their claimed souls gently. They drain lightly, demand little, and grant power freely. Players may believe they've found a loophole: all the benefits, none of the drawbacks.

Disabuse them of this notion.

A kind patron is still an owner. The character is still property. "Kind" means the chain is velvet-lined, not that it isn't a chain. The relationship is fundamentally one of master and possession, regardless of how pleasant the master chooses to be.

Moreover, what happens to the character's soul when the patron trades it, loses it in a wager, or is destroyed by a rival?

Refusing Pacts

Characters may simply refuse every offer. This is heroic and appropriate for many character concepts. It is also difficult.

The voices continue indefinitely. During moments of weakness: injury, despair, the depths of magic sickness; they grow louder. The character must actively resist temptation for the rest of their life.

Playing Temptation: Don't let pact resistance become a simple "I say no" repeated forever. Make each temptation specific to the character's current struggles. The voices know what the character wants, what they fear, what they've lost. They offer exactly what would help most, at exactly the moment it's hardest to refuse.

The Tempest King's Authority

King Trystane rules all waters. The Abyssal Trench, for all its horror, exists within his domain. This means Trystane possesses the authority to:

• Reclaim a soul from an Abyssal patron, breaking the pact entirely
• Silence the voices that plague Abyss survivors, severing the connection
• Command Abyssal entities to release their claims (though ancient beings may resist)
• Cleanse the Mark left by the deep, removing its visible signs

His power in this regard is absolute. If the Tempest King declares a soul free, it is free. No Abyssal entity can gainsay the ruler of the waters in which they dwell.

But Trystane does not intervene lightly. He is King of the waters, not nursemaid to foolish mortals who made poor bargains. A character seeking his aid must offer something worthy of divine attention.

The Phoenix Queen's Renewal

Queen Ashley embodies rebirth and renewal. Where Trystane's power is authority commanding the Abyss to release what it holds, Ashley's power is transformation. She burns away corruption and offers the chance to begin again. This means Ashley can:

• Purify Abyssal taint through divine fire, burning away corruption
• Offer renewal to those trapped in pacts, though the process is neither gentle nor painless
• Replace darkness with light; her blessing can fill the void left by severed Abyssal connections
• Grant new purpose to those who would otherwise remain marked forever

Ashley is compassionate, but compassion does not mean enabling poor choices. She offers renewal to those who have earned it through genuine repentance, significant sacrifice, or service to causes she values.

What the Celestials Require

Divine intervention is not free. The Celestials may demand:

• Service - a task that serves the realm, appropriate to the character's abilities. The scope matches the magnitude of what's being asked.
• Devotion - formal dedication to the Celestial and their values. This is a commitment that shapes the character's life going forward.
• Sacrifice - something the character values must be given up. The sacrifice should hurt; easy trades aren't worthy of divine attention.
• Truth - the Celestials may simply require the character to face what they've done with complete honesty. No excuses, no justifications, no self-deception.
• Nothing - on rare occasions, a Celestial might intervene without requiring payment, simply because the character's situation moves them. Exceptionally rare; perhaps once in a campaign.

The Process of Breaking a Pact

Trystane's Method: The Tempest King asserts his authority over the domain in which the pact was made. The Abyssal patron may resist, but Trystane's sovereignty is absolute within his waters. When it ends, the pact is simply gone. The soul returns to its original owner. But they are also empty. Whatever power the patron provided vanishes. The character starts over, with nothing but their freedom.

Ashley's Method: The Phoenix Queen doesn't sever the pact; she burns it away. This is transformation through divine fire, and it is not gentle. The character experiences their connection to the Abyss being consumed painfully, thoroughly, completely. What remains is clean but scarred, renewed but forever changed. Characters freed this way often bear subtle signs of her blessing.

Silencing the Voices

For characters who never pacted but still suffer the whispers, the Celestials can provide relief short of full intervention.

Trystane's Silence: The Tempest King can command the voices to cease; within his domain, they must obey. However, this silence is not permanent; it must be periodically reinforced. A character under Trystane's protection might find the voices silenced for months or years at a time.

Ashley's Warmth: Ashley's blessing doesn't silence the voices so much as make them easier to bear. Her divine fire fills some of the void the Abyss created, making the whispered offers less tempting because the character no longer feels so empty. Characters under her blessing still hear the voices, but the temptation lacks its edge.

What Divine Aid Cannot Do

• It cannot undo choices. If a character did terrible things while pacted, those actions still happened.
• It cannot restore lost time. Years spent in service to an Abyssal patron are still gone.
• It cannot guarantee safety. A freed character has made enemies.
• It cannot remove memories. What the character experienced, saw, and did remains with them.
• It cannot prevent future temptation. A freed character can always make another pact. The Celestials will not save someone twice.

The Celestial Mark

Characters who receive divine intervention often bear signs of it afterward.

Trystane's Mark might manifest as: an affinity for water that wasn't present before; the scent of sea air that clings to them regardless of location; eyes that reflect light like the surface of the ocean; the sense that the tides pay attention when they speak.

Ashley's Mark might manifest as: warmth that radiates from them in cold environments; hair or eyes with subtle hints of flame color; the faint scent of smoke or incense; a presence that comforts those in despair.

These marks don't grant mechanical benefits. They simply indicate that the character has been touched by something divine.

Running Divine Intervention

• Make them work for the audience. The Celestials don't take appointments. The character needs to attract divine attention through significant actions.
• Make the request a scene. Don't skip to "Trystane says yes." Let the character explain themselves. The Celestials should ask hard questions.
• Make the cost real. Whatever the Celestials require, it should matter. If the sacrifice is trivial, the intervention feels cheap.
• Make the process memorable. The intervention itself should be a significant scene.
• Make the aftermath complicated. Freedom isn't a happy ending; it's a new beginning.

Divine intervention should never feel like a "get out of jail free" card. It should feel like grace unearned, transformative, and carrying its own weight of expectation.

What They Do

• Maintain ancient wards that keep the worst horrors contained
• Track creature movements and predict emergence events
• Advise coastal settlements on defensive measures
• Record everyone who descends (voluntarily or otherwise) into the Trench
• Study artifacts and survivors who return from the deep

Using the Watchers

The Order makes an excellent resource for parties interested in Abyss-related storylines. They can provide:

• Information about specific creatures, locations, or phenomena
• Warnings about what players face (useful for informed consent)
• Quests to retrieve artifacts, rescue survivors, or reinforce failing wards
• Consequences for characters who attract too much Abyssal attention

The Watchers are not antagonists, but they're not entirely friendly either. They've seen too many confident adventurers become casualties or worse. Their default attitude toward Abyss-curious characters is weary skepticism.

Abyssal Seekers

Some people pursue the Trench despite all warnings: treasure hunters, forbidden scholars, power-seekers, and the desperate all find reasons to seek the deep.

The Watchers keep records of these "Abyssal Seekers": who they are, what they sought, and whether they returned. Most entries end with "presumed lost." A few note successful return. Fewer still add troubling observations about what came back.

Player characters who pursue Abyss storylines will eventually find themselves in these records.