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The Once-Ler - AI-generated fantasy Monster

The Once-Ler

The Once-Ler began as a traveling seller with an ingenious product and a talent for persuasion. As demand grew, he expanded his operation, cutting down the groves that supplied his raw materials and dismissing warnings as obstacles to progress. He insists that the resulting ruin was an unfortunate side effect, not the purpose of his success. The name The Once-Ler is the title locals gave him after the last great harvest, when he promised that he would only take one more tree.

Monsters
Medium humanoid · CR 20 · Unique

The Once-Ler

A once-successful merchant-industrialist whose enchanted textile empire has stripped the region of its resources. This custom D&D villain fights with contracts, force magic, and automated factory defenses.
AC19
HP310/310
CR20
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 19 · HP 310 · CR 20

The Once-Ler

Medium humanoid (humanoid, custom legendary villain), lawful evil
Armor Class19 (enchanted coat)
Hit Points310 (23d8 + 207)
Speed
Walk 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterityConstitutionWisdomCharisma
SkillsDeceptionHistoryInsightInvestigationPersuasionSleight of Hand
Damage Resistances
Psychic
Immunities
None
Weaknesses
His control depends heavily on machinery, preparation, and the loyalty of employees.
He can be distracted by the prospect of recovering a valuable patent or protecting his reputation.
His enchanted textiles are vulnerable to sustained fire damage.
Senses
Passive Perception 15
Languages
Common,
Dwarvish,
Goblin
Challenge20
Proficiency Bonus+6
Initiative+5
Legendary Resistance (3/Day). If The Once-Ler fails a saving throw, he can choose to succeed instead. He can do so three times per day.
Magic Resistance. The Once-Ler has advantage on saving throws against spells and other magical effects.
Too Much Invested. The Once-Ler has advantage on saving throws against being charmed.
Legendary Actions. The Once-Ler has three legendary actions, choosing from the options below. He regains spent legendary actions at the start of his turn.

Spells

Custom magic (cantrip, enchantment and evocation). The Once-Ler uses a custom set of magical abilities rather than a full spellcasting list. His force effects and enchanted textiles are described in his actions.

Actions

Multiattack. The Once-Ler makes three attacks, in any combination, with his Brasswood Cane or Contractual Hex.
Brasswood Cane. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 21 () bludgeoning damage plus 13 () force damage. The target must succeed on a Strength saving throw or be knocked prone or pushed up to 15 feet, The Once-Ler's choice.
Contractual Hex. Ranged Spell Attack: to hit, range 120 ft., one target. Hit: 36 () force damage, and the target is branded with a glowing contract mark until the end of its next turn. While marked, it cannot benefit from invisibility.
Thneedstorm. The Once-Ler hurls a spinning cage of enchanted fabric at a point he can see within 120 feet. Each creature in a 20-foot-radius sphere must make a Dexterity saving throw. On a failure, a creature takes 45 () slashing damage and is restrained by clinging fibers. On a success, it takes half damage and is not restrained. A restrained creature can use its action to make a Strength check, freeing itself on a success. The fibers burn away if they take 15 fire damage or more in one turn. Recharge 5-6.
Fine Print. The Once-Ler invokes the terms of a bargain he has made with the world. Up to three creatures he can see within 60 feet must make a Wisdom saving throw. On a failure, a creature takes 27 () psychic damage and is frightened until the end of its next turn. On a success, it takes half damage and is not frightened. A creature that has willingly signed a bargain with The Once-Ler has disadvantage on this save.

Reactions

Objection!. When a creature The Once-Ler can see hits him with an attack, he adds 4 to his AC against that attack, potentially causing it to miss. If the attack misses, he can move up to 10 feet without provoking opportunity attacks.

Legendary Actions

Slip Away. The Once-Ler moves up to half his speed without provoking opportunity attacks.
Cane Strike. The Once-Ler makes one Brasswood Cane attack.
Sales Pitch (costs 2 actions). One creature he can see within 60 feet must succeed on a Wisdom saving throw or have disadvantage on its next attack roll before the end of its next turn.
Enforce the Terms (costs 3 actions). The Once-Ler uses Contractual Hex against one target.
Role
Legendary controller and industrial mastermind
Built for
Designed as a major challenge for a party of four or five 20th-level characters, especially with lair actions and supporting minions.

Gear

  • Brasswood Cane (Magic weapon, Attuned; grants a +2 bonus to attack and damage rolls, included in the statblock.)An enchanted cane that channels force through its brasswood head.
  • Master Contracts (Wondrous item, Priceless as evidence; no combat benefit beyond the creature's custom traits.)A sheaf of magically binding agreements, invoices, and patents.
  • Enchanted Salesman's Coat (Wondrous item, Included in Armor Class.)A coat reinforced with layers of treated fiber and subtle protective enchantments.

Feats

Custom legendary resistance
Custom contract magic
Custom battlefield control

Augmentations

Custom enchanted cane conceals a force-channeling focus.
A clockwork speaking tube carries his voice across his factory grounds.

Notes for the game master

The Once-Ler is a custom legendary creature, not a canonical D&D monster.
He has advantage on saving throws against being charmed.
Legendary Resistance (3/Day): If The Once-Ler fails a saving throw, he can choose to succeed instead.
Magic Resistance: The Once-Ler has advantage on saving throws against spells and other magical effects.
His cane attacks include its +2 magic weapon bonus.

Tactics

  1. Opening

    Begin from cover with a polished sales pitch. Use Fine Print against the most resolute-looking opponents, then have factory machinery and hired guards occupy the party.

  2. Mid-fight

    Use Contractual Hex against a dangerous spellcaster or ranged attacker. Use Thneedstorm to restrain clustered foes, then reposition behind machinery and bodyguards.

  3. End of the fight

    At low hit points, use Fine Print to frighten pursuers, then Thneedstorm to block routes and escape toward a prepared exit. If escape is impossible, offer a bargain that divides the party.

  4. Retreat

    The Once-Ler is a calculating survivor, not a martyr. If reduced below 50 hit points with no allies or escape route, he offers information, wealth, or a signed promise in exchange for his life.

How it fights

Use machinery and allies to keep distance from melee specialists.
Reserve Thneedstorm for clustered enemies or to obstruct a key route.
Target creatures concentrating on spells with Contractual Hex.
Use legendary movement to avoid being surrounded.
Present retreat as a negotiation rather than a rout whenever possible.

Who it attacks first

Spellcasters concentrating on battlefield-control effects
Mobile melee combatants who can reach him
Characters attempting to disable factory machinery
The party member most likely to persuade his workers to defect

Works well with

Animated looms and conveyor hazards can capitalize on creatures restrained by Thneedstorm.
Bodyguards can keep melee attackers away while The Once-Ler targets the party's strongest ranged threat.
A crowded factory floor can make his forced movement and area attacks more dangerous.

How to beat it

Close distance quickly and pressure him so he cannot freely control the battlefield.
Spread out to reduce the impact of Thneedstorm and Fine Print.
Break line of sight or use cover against Contractual Hex.
Use fire to destroy the restraining fibers from Thneedstorm.
Dispel or disable his factory enchantments and cut off support from machines.

Ways to avoid a fight

Negotiate a temporary halt to production in exchange for a credible business advantage or access to scarce resources.
Expose contradictions between his public promises and private contracts to turn workers and investors against him.
Use his records to identify stolen land, unpaid wages, hidden stockpiles, or partners who can be persuaded to help repair the damage.
Challenge him to fund restoration and relinquish control of the factory in return for legal protection or a public hearing.

Ecology

A gaunt, impeccably dressed figure with a sharp nose, tired eyes, and a manicured mustache. His once-fine coat is patched with scraps of brightly colored fabric. He carries a brasswood cane and a stack of contracts bound in green ribbon. Even in a ruined factory, he gestures as though presenting a thriving enterprise.

Behavior

Charming, defensive, and relentlessly self-justifying. He treats threats as potential customers, describes damage as a temporary cost, and believes every crisis can be solved by scaling up production.

How it lives

The Once-Ler is a mortal opportunist, not a natural predator. His factories, agents, and contracts create a human-made ecosystem of dependence: workers need wages, towns need goods, and damaged lands lose the resources that once sustained them.

Lair

His mill complex is a maze of catwalks, conveyor belts, steam vents, and enormous looms. On initiative count 20 (losing initiative ties), he can cause one lair effect: a conveyor shifts creatures on it up to 20 feet; a steam vent fills a 15-foot-radius area with lightly obscuring steam until the next round; or a loom lashes a 20-foot line, forcing creatures there to make a DC 18 Dexterity saving throw or take 14 (4d6) bludgeoning damage and fall prone. He cannot use the same effect two rounds in a row.

Habitat
Industrial estates, deforested valleys, textile mills, company towns, and grand offices overlooking exploited land.

Signs that it is near

Fresh sawdust scattered beneath otherwise idle machinery.
Bright fabric samples pinned to trees, fences, and doorways.
A brass speaking tube repeating sales slogans in an empty factory.
Contracts bearing his distinctive green-ribbon seal.

Tags

legendary,
humanoid,
villain,
industrialist,
controller,
custom

Lore

The Once-Ler began as a traveling seller with an ingenious product and a talent for persuasion. As demand grew, he expanded his operation, cutting down the groves that supplied his raw materials and dismissing warnings as obstacles to progress. He insists that the resulting ruin was an unfortunate side effect, not the purpose of his success. The name The Once-Ler is the title locals gave him after the last great harvest, when he promised that he would only take one more tree.

What drives it

Protect his wealth and legacy, convince others that his enterprise is still necessary, and secure fresh resources to restart production.

After the fight

If defeated, The Once-Ler's machines fall quiet, but their products and profits remain scattered through the region. Locals may argue over whether to destroy the stockpiles, sell them to fund restoration, or preserve them as evidence. If he survives, he is likely to return with a new patent, a hired army, and a revised version of the same promise.

“As demand grew, he expanded his operation, cutting down the groves that supplied his raw materials and dismissing warnings as obstacles to progress.”
From its lore

Variants

The Once-Ler, Boardroom Tyrant: Replace Thneedstorm with a clockwork security system and add animated armor allies.
The Once-Ler, Public Benefactor: Reduce his hit points to 220 and remove Legendary Resistance, but give him social influence and guards who sincerely believe in his promises.
The Once-Ler, Last Patent: If his factory is destroyed, he returns with a portable loom that can create dangerous fiber constructs.

Hooks

Plot hooks

A town asks the party to stop a final harvest that will destroy the last grove in the region.
Workers disappear inside a mill that has continued running after its owner vanished from public view.
A signed contract gives The Once-Ler legal claim to a forest that a local community considers sacred.
A rival company offers the party a fortune to steal The Once-Ler's patents, while intending to continue the same exploitation.

How to use it

Run him as the mastermind in a factory complex, with hazards and minions providing pressure while he controls space.
Make the immediate conflict about stopping a production run, protecting workers, or rescuing a community rather than simply defeating him.
For a direct solo fight, use his three legendary actions and lair actions; otherwise pair him with resilient bodyguards or animated machinery.
Show the consequences of his enterprise before combat so the encounter carries moral and practical stakes.

Treasure

A hoard of coin and trade goods hidden beneath the mill.
Patent papers and contracts that could expose powerful business partners.
A spool of enchanted fiber worth 5,000 gp to a collector or magical artisan, but hazardous if manufactured at scale.
The brasswood cane, a +2 magic weapon that requires attunement.

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