Anthraxus, the Oinodaemon

CR 30 Legendary Entity of Entropy

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Size: Huge
Type: Celestial (Primordial)
Alignment: Chaotic Evil
Armor Class: 22 (Natural Armor)
Hit Points: 1,200 (80d12 + 640)
Speed: 40 ft., fly 60 ft. (hover)

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Ability Scores

Strength	Dexterity	Constitution	Intelligence	Wisdom	Charisma
34 (+12)	28 (+9)	36 (+13)	30 (+10)	30 (+10)	32 (+11)

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Saving Throws

Dex +17, Con +21, Wis +18, Cha +19

Damage Resistances

Necrotic, Poison, Psychic, Fire (half damage)

Damage Immunities

Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Condition Immunities

Poisoned, Charmed, Frightened, Paralyzed, Stunned

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Senses

Darkvision 120 ft., Truesight 60 ft.
Passive Perception 28

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Languages

Abyssal, Common, Celestial, Telepathy 120 ft.

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Challenge Rating

CR 30 (Epic Campaigns)

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Legendary Traits

• Legendary Resistance (3/Day): Anthraxus can choose to succeed on a failed saving throw.
• Aura of Entropy: Creatures within 60 ft. of Anthraxus take 10d6 necrotic damage and are poisoned unless they succeed a DC 26 Constitution save.
• Regeneration: Anthraxus regains 100 hit points at the start of its turn unless it takes radiant damage.
• Inexorable Decay: Non-magical objects within 30 ft. automatically decay unless they have at least 25 hit points.

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Legendary Actions

Anthraxus can take 3 legendary actions, choosing from the following options:

1. Maw of Decay (Costs 2 Actions): Bite a target within 5 feet for 6d12 necrotic damage and paralyze them (DC 28 Constitution save).
2. Corruptive Reach (Costs 1 Action): Curse a target within 30 feet (DC 28 Wisdom save), causing disadvantage on attack rolls, saving throws, and ability checks for 1 minute.
3. Summon Plaguebearers (Costs 3 Actions): Summon 2d4 Plaguebearers to fight for Anthraxus.

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Actions

• Multiattack: Anthraxus makes three attacks: one with Maw of Decay, one with Staff of Pestilence, and one with Claws of Entropy.
• Maw of Decay: Melee Weapon Attack, +22 to hit, reach 5 ft., one target. Hit: 50 (8d10 + 12) necrotic damage. Target must make a DC 28 Constitution save or be paralyzed for 1 minute.
• Staff of Pestilence: Melee or Ranged Weapon Attack, +20 to hit, range 60 ft., one target. Hit: 45 (7d10 + 12) necrotic damage. Target must make a DC 28 Constitution save or be poisoned for 1 hour.
• Claws of Entropy: Melee Weapon Attack, +22 to hit, reach 10 ft., one target. Hit: 44 (7d8 + 12) slashing damage plus 18 (4d8) necrotic damage.

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Spells (Innate Spellcasting)

Anthraxus’s spellcasting ability is Charisma (spell save DC 27). It can cast the following spells:

• At Will: Blight, Control Water, Dispel Magic, Inflict Wounds
• 3/Day Each: Cloudkill, Circle of Death, Flesh to Stone
• 1/Day Each: Power Word Kill, Finger of Death, Plague Storm (Custom spell – creates a 60-ft radius of necrotic damage and poison, creatures in range take 12d6 necrotic damage and are poisoned for 1 hour)

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Regional Effects

• Aura of Decay: The land within 6 miles of Anthraxus’s lair becomes blighted. Creatures within this region suffer 10 (3d6) necrotic damage per hour and are haunted by disturbing hallucinations, causing disadvantage on Wisdom saves.
• Corrupted Terrain: Non-magical plants and animals in this region wither, die, or turn into mutated creatures like Plaguebearers or Vermin Swarms.
• Reality Distortion: Illusions and time-warped effects cause disadvantage on all Wisdom (Perception) checks, and spells with a long casting time are often disrupted.

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Weaknesses

• Radiant Damage: Anthraxus is vulnerable to radiant damage and cannot regenerate while taking it.
• Holy Ground: Sites of strong divine power disrupt its magic, causing disadvantage on all attacks and saving throws within 300 ft. of holy relics or altars.

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Role in Campaigns

Anthraxus is a world-ending force, summoned by dark rites or an unintended consequence of meddling with ancient magics. A perfect final boss for campaigns involving corruption, decay, or apocalyptic threats, it can serve as an unstoppable plague bearer, forcing adventurers to find creative ways to combat the embodiment of decay itself.

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Plaguebearers (Summoned Minions)

Use the Oozing Horror stat block with modifications for a rotting appearance and necrotic damage resistance.

Lore

Anthraxus, the Oinodaemon, is an ancient primordial force that embodies the inevitable decay of all things. Once a celestial being, it now exists to unravel the very fabric of existence. Manifesting as a towering, skeletal figure crowned with spiraling ram’s horns, Anthraxus exudes an aura of death and decay, rotting the land it treads upon. Its glowing green eyes pierce through time itself, seeing the entropy that will eventually consume all.

Anthraxus “Oinodaemon”

There is but a single daemon master and ruler. Known by the title of oinodaemon, he is a unique individual of great power. The present oinodaemon is Anthraxus the Decayed. It is to him that all daemons pay homage.

First appeared in the Monster Manual II (Gary Gygax, 1983) and

converted by Scott Greene. In  the book of Daemons

Anthraxus is the most powerful daemon of the Lower Planes. His position is challenged by other unique daemonic beings, the chief of which are Bubonis, Cholerix, Typhus, Diptherius, Brucilousu, Pneumonis, and Rheumatus, along with others unknown or unrecorded by scholars.

Anthraxus appears as a tall humanoid figure in a rotting grey suit and cape. His head is that of a ram deformed by disease. His mouth foams and the wool pulls away from his skin in handfuls. There are boils and blisters over his exposed skin, and his flesh is pulled taut over his bones.

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Oinodaemon (Anthraxus)
Large outsider (Evil)
Hit Dice	77d8+1001 (1347 hp)
Initiative	+15 (+11 Dexterity, +4 Improved Initiative)
Speed	40 ft
AC	50 (-1 size, +11 Dexterity, +30 natural)
Attacks	2 slams +89 melee
Damage	Slam 2d6+12 and disease
Face/Reach	5 ft by 5 ft/10 ft
Special Attacks	Spell-like abilities, spells, psionics, disease, transfixing gaze, summon daemons, Staff of the Lower Planes
Special Qualities	Damage reduction 50/+5, SR 38, daemon qualities, telepathy, Darkvision 60 ft
Saves	Fort +53, Ref +51, Will +51
Abilities	Strength 35, Dexterity 32, Constitution 36, Intelligence 33, Wisdom 33, Charisma 36
Skills	Bluff +93, Concentration +93, Diplomacy +93, Hide +87, Intimidate +93, Intuit Direction +93, Knowledge (arcana) +93, Knowledge (planes) +93, Knowledge (any three) +93, Listen +93, Move Silently+91, Scry +93, Search +93, Sense Motive+93, Spellcraft +93, Spot +93
Feats	Blind-Fight, Cleave, Dodge, Empower Spell, Enlarge Spell, Extend spell, Great Cleave, Heighten Spell, Improved Initiative, Improved Disarm, Improved Trip, Maximize Spell, Mobility, Power Attack, Quicken Spell, Silent Spell, Spell Penetration, Still Spell, Sunder, Track
Climate/Terrain	Any land and underground
Organization	Solitary or troupe (1d2 ultrodaemons, 1d2 arcanadaemons, 1d2 yagnodaemons, and 2d4 piscodaemons)
Challenge Rating	25
Treasure	double coins; double goods; double items
Alignment	Always neutral evil
Advancement	–

Combat

Anthraxus attacks using his spells, spell-like abilities, and staff in combat.

He will not hesitate to gate in other daemons to assist him.

Spell-Like Abilities: At will – burning hands, detect good, detect magic, detect thoughts, dispel magic, greater invisibility, see invisible, shapechange, and teleport without error (self plus 50 pounds of objects only);

3/day- feeblemind, wall of fire, Wall of Force, and wall of ice. These abilities are as the spells cast by a 20th-level sorcerer (save DC 23 + spell level).

Spells: Anthraxus can replicate sorcerer spells as a 20th-level caster (DC 23 + spell level).  He can also replicate cleric spells as a 20th-level caster (DC 21 + spell level).

Anthraxus has access to the domains of Death, Destruction, and Evil.

Psionics (Sp): At will – detect evil, plane shift, polymorph self, and suggestion. These abilities  are as the spells cast by a 20th-level sorcerer (save DC 23 + spell level).

Transfixing Gaze (Su): Held (as Hold Person spell) until released by Anthraxus, 30 feet, Will save  (DC 61) negates.

Disease (Ex): Touch, double strength demon fever (2d6 temporary Constitution damage per day, DC 36 to remove, must succeed at second Fortitude save or lose 2 points of Constitution permanently).

Staff of the Lower Planes: Can only be wielded by another daemon upon the death of Anthraxus.

• The staff has the following powers: at will – desecrate, doom, fear, mass charm, suggestion, and unholy aura;
• 1/day – wish.
• These are as the spells cast by a 20th-level sorcerer (save DC 15 + spell level).
• The staff’s powers automatically overcome any other daemon’s Spell Resistance.
• Any non-daemon that touches the staff takes 8d8 points of electrical damage per round of contact.

Summon Daemons (Sp): Anthraxus can automatically summon 2d8 hydrodaemons, derghodaemons, or piscodaemons; or 2d6  yagnodaemons, charonadaemons, or mezzodaemons; or 1d8 nycadaemons or arcanadaemons, or 1d6 ultrodaemons.

Daemon Qualities (Ex): Immune to poison and Paralysis, immune to mind-influencing effects; acid, cold, and fire resistance 40.

Telepathy (Su): Anthraxus can communicate telepathically with any creature within 100 feet that has a language.