Jevil, Jester of the Chaos Court
Medium or Small Humanoid, Chaotic Neutral
AC 18 Natural Agility    Initiative +14 (24)
HP 225 (18d8 + 144)
Speed 40 ft., Climb 40 ft.
Mod Save
STR 14 +2 +2
DEX 20 +5 +10
CON 18 +4 +4
Mod Save
INT 14 +2 +2
WIS 14 +2 +7
CHA 18 +4 +9
Skills Perception +7, Stealth +9
Resistances Psychic; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Immunities Charmed, Frightened
Senses Darkvision 120 ft.; Passive Perception 17
Languages Common and "Whatever You're Speaking"
CR 13 (XP 10,000; PB +5)
Traits

Legendary Resistance (3/Day, or 4/Day in Lair). If Jevil fails a saving throw, it can choose to succeed instead.

I CAN DO ANYTHING!.  Jevil can climb difficult surfaces, including along ceilings, without needing to make an ability check as if under the effects of the Spider Climb spell.

Freedom Engine. Jevil generates Freedom Points (FP) based on his voluntary movement, which fuel the Chaos Pool. Jevil gains 1 FP for each of the following:

  • Every 30 feet of movement Jevil makes
  • Once instance of Teleporting 

Movement forced by other creatures does not generate Freedom Points. Each time Jevil is subjected to a hard control effect that significantly restricts his movement or actions, such as being grappled, restrained, stunned, or paralyzed, he loses 1 Freedom Point. At the start of initiative, Jevil draws cards into the Chaos Pool equal to his current Freedom Points.

Actions

Multiattack. Jevil makes two attacks: two Suit Shots or one Suit Shot and one Devilknife Swipe.

Suit Shot. Ranged Spell Attack: +9 to hit, range 120 ft., one target
Hit: 13 (3d6 + 3) force damage
If the target has not moved since its last turn, it takes an additional 7 (2d6) psychic damage.

Devilknife Swipe. Melee Weapon Attack: +10 to hit, reach 5 ft., one target
Hit: 17 (2d10 + 6) slashing damage

Spellcasting. Jevil casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 17, +9 to hit with spell attacks).

At will: thaumaturgy, minor illusion, mage hand, gust

4/day each: grease, earth tremor, jump (self only)

3/day each: catapult, levitate, blur, nathair's mischief

3/day each: pulse wave, fear, erupting earth

2/day each: gravity sinkhole, confusion

1/day: gravity fissure

Bonus Actions

Summon The DevilKnife. Jevil summons 1d4 Devilknives in unoccupied spaces he can see within 30 feet of him. A summoned Devilknife lasts until destroyed or until consumed by a Chaos effect. Jevil can have a maximum number of Devilknives equal to his proficiency bonus active at one time. If summoning Devilknives would exceed this limit, Jevil chooses which existing Devilknives are destroyed.

OH! (Recharge 3-6). Jevil teleports up to 40 feet to an unoccupied space he can see. Before or after teleporting, he can make one Suit Shot or Devil Kinfe Swipe attack.

Reactions

THIS BODY CANNOT BE KILLED! (Recharge 3-6). Jevil teleports up to 40 feet to an unoccupied space he can see. Before or after teleporting, he can make one Suit Shot or Devil Kinfe Swipe attack.

Legendary Actions

Legendary Action Uses: 3 (4 in Lair). Immediately after another creature’s turn, Jevil can expend a use to take one of the following actions. The vampire regains all expended uses at the start of each of its turns.

Summon The DevilKnife (1). Jevil summons 1 Devilknife in an unoccupied space whithin 30 ft.

Skitter (1): Move up to 20 ft. without provoking opportunity attacks

Devilknife Recall (1): Jevil teleports to an unoccupied space adjacent to a Devilknife he can see.

Suit Shot (2): Make one Suit Shot attack

Devilknife Assault (2): Jevil teleports to an unoccupied space adjacent to a Devilknife he can see and makes one Devilknife Swipe against a creature within 5 feet of that Devilknife.

Description

Jevil, Jester of the Chaos Court

Jevil is a lair boss that treats the battlefield as a stage and the adventurers as pieces in a game that only he fully understands. Jevil fights through constant motion, spatial disruption, and escalating pressure rather than raw damage. His goal is not to overwhelm the party in a single turn, but to destabilize their positioning and force mistakes over time.

Combat


In combat, Jevil is almost always moving. He darts across walls and ceilings, teleports unpredictably, and uses forced movement effects to scatter the party or pull them into dangerous formations. Jevil prefers to remain difficult to pin down, retreating from direct confrontation whenever possible. Restricting his movement meaningfully slows the pace of the encounter, while allowing him to move freely causes the fight to spiral rapidly out of control.

Jevil makes extensive use of Devilknives to control space. These floating blades act as persistent hazards, discouraging safe positioning and punishing careless movement. Jevil frequently summons Devilknives early in the fight to establish zones of danger, then manipulates their placement through spells and Chaos effects. Devilknives are rarely used for immediate damage; instead, they function as delayed threats that become lethal when combined with Jevil’s gravity-based magic and catapult spells.

Spellcasting & Combos


Jevil’s spellcasting emphasizes battlefield disruption rather than direct damage. He uses spells such as pulse wave and gravity sinkhole to reposition both creatures and Devilknives, often pulling blades toward clustered characters or flinging them through the party. He may follow this by casting catapult to hurl a Devilknife at a vulnerable target. These combinations reward careful preparation and awareness of the stage.

DMs should think of Devilknives as ammunition as much as hazards. He may draw Devilknives inward with gravity effects, teleport between them to strike multiple targets, or collapse them all at once using the Spades ALL-IN effect to deal massive area damage.

Ending the Fight

As the Chaos Pool nears its conclusion, his actions grow more frantic but also more theatrical, culminating in a final surge of Chaos before exhaustion overtakes him. When the Big Joker is drawn, Jevil willingly surrenders, satisfied that the game has been played to its end.

Running Jevil effectively requires treating the encounter as a dynamic system rather than, ironically, a numbers game of exchanging attacks. A well-played Jevil pressures the party through movement, forces difficult positioning choices with devilknives & spells, and turns the environment itself into the primary threat. 
Players have agency in deciding how to end the fight:

Do they try to control Jevil's freedom and lower his HP quickly, but suffer from a prolonged encounter?

Or by embracing Jevil's chaotic game and tiring him out? 

Lair and Lair Actions

LAIR OF CHAOS

Jevil’s lair manifests through the Chaos Pool, replacing traditional lair actions. The Chaos Pool uses a custom Chaos Deck.

CHAOS DECK

The Chaos Pool is fueled by a custom Chaos Deck.

The Chaos Deck consists of eight numbered cards (2–10) per party member, divided evenly among the four suits.

In addition to the numbered cards, the deck contains one of each royal card: Ace, King, Queen, and Jack.

The deck also includes two Jokers: one Small Joker and one Big Joker.

Example: In a party of 4, there should be 24 numbered cards (8 from each suit), 1 King, 1 Queen, 1 Jack, 1 Ace, 1 Big Joker, 1 Small Joker.

Before play begins, the bottom of the Chaos Deck is arranged in a specific order:

  • The Big Joker is placed at the very bottom of the deck.
  • The Small Joker is placed second from the bottom, directly above the Big Joker.
  • All remaining cards are shuffled normally.

THE CHAOS POOL

At the start of initiative, Jevil draws a number of cards from the Chaos Deck equal to his current Freedom Points (FP) and places them face-up into the Chaos Pool.

The Chaos Pool can hold up to five cards at a time.

When the Chaos Pool reaches its maximum size, it immediately resolves.

  • If no face cards are present, the Chaos suit that appears most frequently triggers its associated Chaos effect.
  • If a face card is present, suit resolution is ignored and the face card effect resolves immediately.

PIROUETTE ACTion

A creature may intentionally engage with Jevil’s game, accelerating the flow of chaos.
As a bonus action on its turn, a creature can draw one card from the Chaos Deck and place it face-up into the Chaos Pool, provided the Chaos Pool is not locked.

This action may be taken once per turn.

Drawing a card in this way may immediately trigger a Chaos effect if the Chaos Pool reaches its maximum size.

The creature taking this action has no control over which card is drawn.

 CHAOS SUIT EFFECTS (4 TOTAL)

♠ SPADES — ALL-IN

Jevil recalls every Devilknife on the battlefield in a deadly convergence.
Each Devilknife draws a 5-foot wide straight line from its space to Jevil’s space.
Each creature whose space is intersected by one or more of these lines must make a DC 17 Dexterity saving throw.

  • Failure: The creature takes 33 (6d10) slashing damage.

  • Success: The creature takes half as much damage.

After resolving these lines, all Devilknives merge into a single massive scythe at Jevil’s location and immediately explode in a 20-foot-radius burst.

Each creature in that area must make a DC 17 Dexterity saving throw.

  • Failure: The creature takes 27 (5d10) slashing damage and is knocked prone.

  • Success: The creature takes half as much damage and isn’t knocked prone.

All Devilknives are destroyed at the end of this effect.

♥ HEARTS — GROUP HUG

Jevil's games bring people together.

Each creature of Jevil’s choice within 30 feet of him regains 14 (4d4 + 4) hit points.

Immediately after, each creature in that area must make a DC 17 Strength saving throw.

  • On a failure, the creature is pulled to the center of the area and is knocked prone.
  • On a success, the creature is not pulled and remains standing.

The area becomes difficult terrain until the start of the next initiative count.

♦ DIAMONDS — MUCK FEST

Reality folds its hand.

Starting with the two creatures that are furthest apart, those creatures instantly swap positions. This process then repeats with the next furthest pair of creatures, continuing until all creatures that can be paired have swapped positions.

  • A creature can only be swapped once by this effect.

  • This movement does not provoke opportunity attacks.

Creatures that cannot be paired remain in place.

♣ CLUBS — BONK

Jevil weaponizes momentum and positioning in a blur of motion.

Jevil instantly teleports to each Devilknife on the battlefield in any order he chooses. At each Devilknife’s location, Jevil may make one Devilknife Swipe against a creature within 5 feet of that Devilknife.

After resolving all attacks, Jevil appears in an unoccupied space of his choice adjacent to any remaining Devilknife.

ROYAL & JOKER EFFECTS

Jack — EVERYWHERE ALL AT ONCE

Distance ceases to offer safety.

Until the start of the next initiative count, all creatures are considered adjacent to one another for the purposes of opportunity attacks, threatened spaces, and abilities that require adjacency.

Movement, positioning, and distance still apply normally for the purposes of movement speed, spell ranges, and area-of-effect calculations.

Queen — IT’S JUST A SIMPLE CHAOS.

Jevil plays a numbers game.

All party members’ current hit points and maximum hit points are randomly redistributed among them. Each creature retains its original hit point total only in distribution, not identity.

  • Any creature that was reduced to 0 hit points before this effect is instead restored to 1 hit point after redistribution.

This effect persists until the party uses the Pirouette ACTion a total number of times equal to the number of party members minus 1.

  • When this condition is met, all hit point values immediately return to normal.

King — WHO KEEPS SPINNING THE WORLD AROUND?!

Jevil twists the battlefield, redefining which way is down.

Jevil chooses one cardinal direction. That direction becomes down for all creatures.

Each creature that is not flying or otherwise secured must make a DC 17 Strength saving throw.

  • Failure: The creature falls 20 feet in the chosen direction and is knocked prone.

  • Success: The creature remains in place.

This effect lasts until the start of the next initiative count, after which gravity returns to normal.

Ace — METAMORPHOSIS

Who's turn is it again?

Each player passes their character sheet to another player of the DM’s choice. Each player assumes full control of the new character sheet they receive.

  • Players may not ask questions about the character they are controlling.

  • This effect lasts until the start of the next initiative count.

At the end of the effect, all character sheets are returned to their original owners.

Small Joker — CHAOS BOMB

The game nears its inevitable conclusion.

When the Small Joker enters the Chaos Pool, the following effects occur immediately:

  • The Pirouette ACTion can no longer be used by players.

  • The Chaos Pool becomes locked; players cannot add or remove cards from it.

At the start of the next initiative count, Jevil unleashes a Chaos Bomb, resolving one Chaos suit effect of each type (Spades, Hearts, Diamonds, and Clubs) in an order of his choice.

Big Joker — Jevil is truly exhausted!

Jevil is tired out!

When the Big Joker is drawn, all ongoing Chaos effects immediately end. The battlefield stabilizes, and Jevil becomes exhausted and pacified.

The encounter immediately ends.

Akely

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