BBEG: Kaemon, Demon Lord

 

Kaemon, Demon Lord

Huge Fiend (Demon), Chaotic Evil

• Armor Class: 21 (natural armor)

• Hit Points: 385 (26d12 + 216)

• Speed: 40 ft., swim 60 ft.

STR	DEX	CON	INT	WIS	CHA
28 (+9)	14 (+2)	27 (+8)	18 (+4)	20 (+5)	22 (+6)

• Saving Throws: Str +16, Con +15, Wis +12, Cha +13

• Skills: Athletics +16, Perception +12, Stealth +9

• Damage Resistances: Cold, Fire, Lightning

• Damage Immunities: Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

• Condition Immunities: Charmed, Frightened, Poisoned, Prone

• Senses: Truesight 120 ft., Passive Perception 22

• Languages: Abyssal, Telepathy 120 ft.

• Challenge: 24 (62,000 XP) | Proficiency Bonus: +7

Traits

• Amphibious: Kaemon can breathe air and water.

• Hold Breath: Kaemon can hold his breath for 1 hour.

• Legendary Resistance (3/Day): If Kaemon fails a saving throw, he can choose to succeed instead.

• Magic Resistance: Kaemon has advantage on saving throws against spells and other magical effects.

• Magic Weapons: Kaemon's weapon attacks are magical.

Actions

• Multiattack: Kaemon makes four attacks: one with his Bite, one with his Pincer, one with his Tentacle, and one with his Sting.

• Bite: Melee Weapon Attack: +16 to hit, reach 10 ft., one target.

  Hit: 25 (3d10 + 9) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 23). Until this grapple ends, the target is restrained, and Kaemon cannot bite another target.

• Pincer Claw: Melee Weapon Attack: +16 to hit, reach 15 ft., one target.

  Hit: 22 (3d8 + 9) bludgeoning damage plus $9$ ($2\text{d}8$) slashing damage. If the target is a Huge or smaller creature, it is grappled (escape DC 23). Kaemon has two pincers, each of which can grapple one target.

• Tentacle: Melee Weapon Attack: +16 to hit, reach 20 ft., one target.

  Hit: 18 (2d8 + 9) bludgeoning damage. If the target is a creature, Kaemon pulls it up to 15 feet straight toward him, and it must succeed on a DC 23 Strength saving throw or be knocked prone.

• Scorpion Sting: Melee Weapon Attack: +16 to hit, reach 15 ft., one target.

  Hit: 20 (2d10 + 9) piercing damage plus 28 (8d6) poison damage, and the target must succeed on a DC 23 Constitution saving throw or be poisoned for 1 minute. While poisoned in this way, the creature takes 14 (4d6) poison damage at the start of each of its turns. The target can repeat the saving throw at the end of each of its turns, ending the effect on a success.

• Death Roll (Recharge 5–6): Kaemon violently thrashes with a creature currently grappled in his jaws. The target takes 42 (6d10 + 9) bludgeoning damage, is knocked prone, and is stunned until the end of its next turn on a failed DC 23 Dexterity saving throw, or takes half as much damage and is not stunned on a success.

Innate Spellcasting

Kaemon's innate spellcasting ability is Charisma (spell save DC 21, +13 to hit with spell attacks). He can innately cast the following spells, requiring no material components:

• At will: contagion, create or destroy water, dissonant whispers, ray of enfeeblement

• 3/day each: control water, enemies abound, synaptic static, blight

• 1/day each: dominate monster, feeblemind, tsunami

Tactical Synergies

• Opening Gambit: Kaemon opens with synaptic static to muddle the minds of spellcasters and sap attack rolls before closing into melee.

• Control & Isolation: While holding an enemy in his crush grip or bite, he casts enemies abound or dissonant whispers to force panicked allies to scatter or turn on each other in the brine.

• Rot Infliction: Using contagion (Slimy Doom or Flesh Rot) in tandem with his Death Roll and Scorpion Sting guarantees target vulnerability and rapid action denial.

Legendary Actions

Kaemon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Kaemon regains spent legendary actions at the start of his turn.

• Tentacle Sweep: Kaemon lashes out with an octopus tentacle at a target within 20 feet.

• Venomous Strike (Costs 2 Actions): Kaemon makes one attack with his Scorpion Sting.

• Crush (Costs 2 Actions): Kaemon constricts with his pincers. Each creature currently grappled by his pincers takes 22 (3d8 + 9) bludgeoning damage and must succeed on a DC 23 Constitution saving throw or lose its breath and be unable to speak or cast spells with verbal components until the start of Kaemon's next turn.

• Abyssal Surge (Costs 3 Actions): Foul brine and necrotic muck erupt around Kaemon in a 20-foot radius. Each creature in that area must make a DC 23 Dexterity saving throw, taking 21 (6d6) necrotic damage and falling prone on a failure, or half as much on a success.

Why the d12 Deserves Your Table

 

The Redemption of the Red-Headed Stepchild: Why the d12 Deserves Your Table

Let’s address the elephant in the room: the poor d12 is the neglected red-headed stepchild of the polyhedral family. Aside from rolling a barbarian's greataxe damage or checking the calendar months on a wilderness crawl, it mostly just rattles around at the bottom of the dice bag gathering dust.

Part of it is historical momentum. D&D inherited the standard d6, d8, d20, and the percentile d100 from wargaming, and picked up the d4 and d12 along the way from older systems. But while the d6 and d8 became the workhorses for intermediate random generation and the d10/d100 locked down percentages, the d12 got squeezed out. Designers write for d6s because everyone has a handful of them, they write for d10s and d100s for percentages, and they write for d20s because that's what the math is built on. The d12 is left sitting there with a prime number of sides that doesn't divide cleanly into anything useful for standard probability distribution, and nobody wants to bother engineering tables around it.

Which is a shame, because a 12-sided spread is actually a sweet spot for a DM's quick-reference spark table. It's wide enough to give real variety—unlike a d6—without requiring you to scan through a massive list of twenty options when you need a quick ruling at the table.

Fun Fact: The proper geometric name for your lonely d12 is a regular dodecahedron—a Platonic solid made up of 12 identical regular pentagons meeting at 20 vertices with 30 edges (dodeka meaning twelve, and hedra meaning base or face).

Hacking the Geometry of Probability

If we're going to drag the d12 out of retirement and give it some legitimate work to do, we need to look at its probabilities directly. Not just the flat 1-in-12 chance of a certain number appearing, but grouping sub-sets of numbers for increased and decreased probabilities.

Because 12 can be factored cleanly into halves, thirds, quarters, and sixths, you can carve it up into non-uniform buckets that do heavy lifting without breaking out extra dice pools. You just roll one die and look at where it lands.

Fun Fact: Plato assigned the dodecahedron to the cosmos and the heavens in his work Timaeus, because its 12 faces matched the signs of the Zodiac and it looked closer to a sphere than the sharp, spiky tetrahedrons and cubes representing fire and earth.

Engine One: The Rarity-Tiered Split (Dungeon Rooms & Vaults)

When the party breaches a forgotten vault or tears through a dusty corridor, you don't want to slow the game down rolling a d% for rarity and then another die for the actual item. By mapping the d12's faces into clean percentage buckets (50% Common, 33% Uncommon, and 17% Rare), a single roll tells you both how common the discovery is and what it actually is:

• 1–6 (The Common Tier / 50%): Routine atmospheric details or mundane set-dressing.

• 7–10 (The Uncommon Tier / 33%): Significant encounters, working mechanisms, or tactical complications.

• 11–12 (The Rare Tier / 17%): High-impact secrets, major loot vaults, or plot-critical artifacts.

d12 Roll	Rarity Tier	Room Feature, Discovery, & Encounter State
1–6 (50%)	Common Tier	Mundane Atmosphere / Standard Dressing: Scraps of rotted furniture, old bones, soot-stained walls, dripping condensation, or empty iron brackets where torches once hung. Pure set-dressing that builds the mood without altering tactical reality.
7 (8.3%)	Uncommon Tier	Active Clue / Working Mechanism: A functional lever, an intact inscription on a wall frieze, fresh bootprints in the dust, or a half-hidden niche containing a usable mundane tool or coin pouch.
8 (8.3%)	Uncommon Tier	Environmental Hazard: Unstable flagstones, a rusted tripwire connected to a poisoned dart chute, or a pocket of stagnant, foul air requiring a quick constitution check.
9 (8.3%)	Uncommon Tier	Opportunistic Threat: A nest of giant centipedes, a territorial scavenging beast cornered in the dark, or a lingering minor haunting that imposes disadvantage on short rests until cleared.
10 (8.3%)	Uncommon Tier	Favorable Advantage: A defensive choke point, a stash of abandoned rations or oil flasks left by a previous ill-fated party, or an alcove providing total cover.
11 (8.3%)	Rare Tier	Major Vault / Hidden Cache: A locked strongbox or reliquary containing actual trade bars, masterwork components, or a scroll of genuine arcane utility.
12 (8.3%)	Rare Tier	Major Lore / Plot Artifact: A glowing altar, an ancient magical inscription tied to the dungeon's creator, or a unique signature item that cracks wide open a major faction secret or questline.

Fun Fact: Centuries after Plato, Johannes Kepler tried to use a concentric series of Platonic solids—including nesting a dodecahedron—to explain the physical orbital distances of the planets in our solar system.

Engine Two: The Center-Weighted Bell Curve (Wilderness & Weather)

If you prefer a distribution that mimics a 3d6 bell curve—keeping the middle steady while the sharp 1-in-12 edges throw genuine curveballs—you can map the center-weighted layout. Drop this into your hex-crawl notes:

d12 Roll	Probability Tier	Wilderness Condition & Encounter State
1	The Lower Extreme (8.3% / 1-in-12)	Cataclysmic Shift / Apex Threat: Freak weather turns hostile instantly (flash flood, blinding whiteout, sudden gale-force squall) coupled with an apex predator or hostile regional faction hunting in the worst possible conditions.
2–4	The Upper Intermediate Band (25% / 3-in-12)	Active Complication: A notable regional patrol, aggressive territorial fauna, or deteriorating weather (persistent heavy rain, choking fog, dropping temperatures) that taxes resources and forces a tactical decision.
5–8	The Baseline Core (33.3% / 4-12)	Routine Travel: The wilderness hums along as expected. Weather is mild or seasonally typical; tracks and distant wildlife signs are visible, but nothing engages the party directly. Standard march rate maintained.
9–11	The Lower Intermediate Band (25% / 3-in-12)	Favorable Shift / Minor Opportunity: Weather breaks in the party's favor (cloud cover cooling a hot march, tailwind), or they cross paths with neutral travelers, abandoned way-markers, or a minor foraging opportunity.
12	The Upper Extreme (8.3% / 1-in-12)	Miraculous Boon / Landmark Reveal: Perfect traveling conditions, the sudden discovery of a hidden spring, a safe sheltered alcove out of the elements, or stumbling directly upon a long-lost trail marker or waypoint.

Fun Fact: The ancient d12 actually saw some of its earliest historical use not for math or war games, but as Roman astrological and divinatory tools—making it an ancient random-generation table in its own right.

Time to Clear the Dust

Stop letting your d12 sit at the bottom of the velvet bag acting as a glorified paperweight or an occasional barbarian damage multiplier. By leaning into its factors, you can build single-die engines that give you statistical curves, narrative weight, and instant table utility all in one roll.

It’s time to put the shape of the cosmos back to work.

New Monster: Sharktopus

 

Sharktopus

5E Stat Block

Monstrosity, Typically Neutral

• Armor Class: 15 (natural armor)

• Hit Points: 112 (15d10 + 30)

• Speed: 10 ft., swim 40 ft.

STR	DEX	CON	INT	WIS	CHA
19 (+4)	14 (+2)	15 (+2)	3 (-4)	12 (+1)	6 (-2)

• Skills: Perception +4, Stealth +5

• Senses: Darkvision 60 ft., passive Perception 14

• Languages: —

• Challenge: 6 (2,300 XP) | Proficiency Bonus: +3

• Water Breathing: The sharktopus can breathe only underwater, but it can hold its breath out of water for up to 1 hour.

• Ambush Predator: In the first round of combat, the sharktopus has advantage on attack rolls against any creature it has surprised.

Actions

• Multiattack: The sharktopus makes one Bite attack and up to two Tentacle attacks.

• Bite: Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.

• Tentacle: Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 10 (2d4 + 4) bludgeoning damage, and the target is grappled (escape DC 15). Until this grapple ends, the target is restrained, and the sharktopus can't use this tentacle against other targets. The sharktopus has six tentacles.

• Ink Jet (Recharge 5–6): The sharktopus expels a dense cloud of caustic, viscous ink. The effect depends on whether it is submerged or ashore:

  • In Water: A 30-foot radius sphere of ink erupts centered on the sharktopus. The area becomes heavily obscured for 1 minute. Any creature that starts its turn in the cloud or enters it for the first time on a turn must make a DC 14 Constitution saving throw, taking 14 (4d6) acid damage and becoming poisoned until the end of its next turn on a failed save, or half as much damage and no poison on a success.

  • Out of Water: The sharktopus fires a high-pressure jet of black slime in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 14 Dexterity saving throw. On a failure, a target takes 14 (4d6) acid damage, is blinded, and is restrained by sticky, tar-like residue (DC 15 Strength check to break free as an action). On a success, it takes half damage and isn't blinded or restrained.

OSR Stat Block (B/X / Old-School Essentials)

• Armor Class: 5 [14]

• Hit Dice: 8* (36 hp)

• Attacks: 1 × bite (2d6) + 4 × tentacle (1d4 + constriction)

• Move: 90' (30') swimming / 20' (10') crawling on land

• Saving Throw: F6

• Morale: 9

• Hoard Class: None

• Alignment: Neutral

• Constriction: Targets hit by two or more tentacles are constricted, taking an automatic 2d6 damage per round and unable to move or cast spells requiring somatic components until they break free with a successful strength check at a -2 penalty.

• Ink Jet: Once per day (or 1-in-6 chance per combat round), the sharktopus can discharge a massive cloud of chemical ink:

• Submerged: Creates an opaque, murky cloud 40 feet across. Vision is reduced to zero. Furthermore, the chemical stings eyes and gills; anyone breathing or touching the water must save vs. Poison or be blinded and choking for 1d4 rounds, fighting with a -4 penalty to attack rolls.

• Ashore: Fires a blinding, caustic stream up to 30 feet away targeting a single combatant or tight group. Requires a successful attack roll against AC 5. A target hit takes 2d6 acid damage and is blinded and coated in sticky black sludge for 1d4 turns unless washed thoroughly with strong solvents or alcohol.

Background:

Deep in the abyssal trenches where the sun never bleeds, or rotting away in a salt-crusted coastal laboratory that time forgot, the sharktopus is no natural beast. It is the unholy pinnacle of marine crossbreeding and necromantic surgery.

According to ancient mariner logs and the mad ramblings of salt-cured sages, the first of these monstrosities were engineered by Xaloc the Drowned, a high merman wizard whose descent into lichdom mirrored his obsession with apex predation. Disgusted by the fragile diplomacy of the Merfolk kingdoms and the clumsy bulk of traditional sea-monsters like krakens, Xaloc sought to forge the ultimate living weapon: an entity combining the unrelenting, forward-driving momentum and sensory aggression of a great white shark with the prehensile, tactical cruelty of an ancient octopus.

Using high-pressure arcane vats filled with preserved brine, dark necromancy, and alchemical mutagens, the mad merman lich stitched together the jaws and cartilage of a deep-water leviathan with the muscular, multi-limbed mantle of a giant cephalopod. But Xaloc did not stop at mere flesh-crafting. He infused the creature's digestive glands with a concentrated, alchemically distilled necro-toxin—a corrosive, black bile that functions as its signature ink jet.

Submerged in the ocean depths, this viscous black cloud acts as a suffocating, acid-laced smokescreen that dissolves an enemy's vision and defenses in seconds. Yet, because the lich designed his abominations to clear out coastal fortifications and smash surface-running ships, the creature's ink gland adapts when it is dragged ashore. Exposed to open air, the compressed venom super-reacts with oxygen, transforming into a high-pressure, blinding stream of tar-like caustic slime that can fuse a sailor to the deck or strip the flesh from a landing party.

Though Xaloc’s sunken spire was eventually shattered by coastal tides and rival sea-lords, his biological horrors did not die with him. Sharktopuses now breed in the dark, forgotten trenches of the world, rising from the black depths whenever hunger or the residual magics of their mad creator call them to the surface.