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The Iron Oracle - AI-generated fantasy Monster

The Iron Oracle

Created by the First Archmage of the Argent Spire, the Iron Oracle was built not to kill, but to challenge. However, as the centuries passed and its internal logic evolved, its definition of a 'passed' test has become increasingly lethal. It guards the Chancellor's Sigil, the physical artifact required for a student to be recognized as a Master of the Arts.

Huge construct · High · Unique

The Iron Oracle

A majestic and lethal final examination construct designed to test the tactical and magical prowess of graduating wizards.
AC21
HP297/297
CRHigh
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 21 · HP 297 · High

The Iron Oracle

Huge construct (automaton), lawful neutral
Armor Class21 (Natural Armor)
Hit Points297 (18d12 + 126)
Speed
40 ft. walk,
30 ft. fly (hover)
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsConstitutionWisdomStrength
SkillsPerceptionArcana
Damage Resistances
Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Immunities
Poison,
Psychic,
Blinded,
Charmed,
Deafened,
Exhaustion,
Frightened,
Paralyzed,
Petrified,
Poisoned
Weaknesses
Vulnerability to Thunder damage
Senses
Truesight 120 ft.,
Passive Perception 21
Languages
Understand Common and Celestial but cannot speak
ChallengeHigh
Immutable Form. The Oracle is immune to any spell or effect that would alter its form.
Magic Resistance. The Oracle has advantage on saving throws against spells and other magical effects.
Chime of Resonance. Any creature that starts its turn within 15 feet of the Oracle must succeed on a Constitution saving throw or take 10 () thunder damage as the chime-like movements rattle their bones.

Actions

Multiattack. The Oracle makes two attacks with its Burning Brand and one use of Sands of Time.
Burning Brand. Melee Weapon Attack: to hit, reach 15 ft., one target. Hit: 20 () bludgeoning damage plus 18 () fire damage. The target must succeed on a Strength saving throw or be knocked prone.
Sands of Time. The Oracle tilts its hourglass. Each creature in a 30-foot cone must succeed on a Wisdom saving throw. On a failed save, a creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last until the end of the Oracle's next turn.
Final Verdict (Recharge 5-6). The Oracle releases a concentrated pulse of golden light. Each creature within 60 feet must make a Intelligence saving throw. On a failure, a creature takes 66 () radiant damage and is stunned until the end of its next turn. On a success, it takes half damage and is not stunned.

Reactions

Spell Reflection. When the Oracle is targeted by a spell or included in a spell's area, it can force the caster to make a Wisdom saving throw. On a failure, the Oracle is unaffected by the spell, and the spell is instead reflected back at the caster. The spell uses the Oracle's stats for any attack rolls or save DCs, but is treated as if it originated from the Oracle's position toward the caster.

Legendary Actions

Slam. The Oracle makes one slam attack with a free hand ( to hit, 18 () bludgeoning damage).
Shift Gravity (costs 2 actions). The Oracle causes the floor beneath one creature it can see within 60 feet to lurch. The target must succeed on a Dexterity saving throw or fall 20 feet upward into the ceiling, taking fall damage as normal.
Inversion (Costs 3 Actions) (costs 3 actions). The Oracle resets its hourglass. All creatures within 30 feet that have ongoing conditions (such as Haste, Slow, or Poisoned) must immediately end those effects and take 5 () force damage for each effect ended.
Role
Solo Boss
Built for
15 to 17

Gear

  • The Oracle's Hourglass (Artifact, Priceless)A massive time-manipulating device that serves as the construct's heart.
  • The Brand of Judgment (Weapon, Priceless)A massive polearm tipped with white flame.

Feats

Sentinel
Mage Slayer

Augmentations

Chronal Stabilizer Core

Notes for the game master

The Oracle's reflection ability should be telegraphed to the players through the glowing sapphire lens on its head.
Its vulnerability to thunder is due to the fragile nature of its ceramic casing.

Tactics

  1. Opening

    The Oracle uses Sands of Time immediately to limit the movement of the party and gain action economy advantage.

  2. Mid-fight

    Focuses the Burning Brand on the most physically weak-looking characters while saving its reaction for the most powerful spell cast each round.

  3. End of the fight

    As it drops below 50 hit points, it uses Final Verdict and focuses solely on preventing the players from reaching the Chancellor's Sigil.

  4. Retreat

    The Iron Oracle cannot retreat and will fight until it is reduced to 0 hit points, at which point it crumbles into inert dust.

How it fights

Uses Shift Gravity to separate healers from the front line.
Prioritizes reflecting 'Control' spells over 'Damage' spells to keep the party's tactics in disarray.
Uses movement to stay in the center of the room to maximize the Chime of Resonance aura.

Who it attacks first

Clerics (to stop healing)
Wizards (to test their specific graduation requirements)
Fighters (to maintain distance)

Works well with

Anti-Magic Fields
Time Stop spells
Moving platforms

How to beat it

Thunderwave
Shatter
Silence (negates the Chime of Resonance aura)

Ways to avoid a fight

A character can attempt a DC 25 Arcana check to temporarily stall the Oracle's hourglass, delaying its next turn.
The Oracle can be bypassed if the party provides a valid Chancellor's Hall Pass (a rare hidden item in the tower).

Ecology

A twenty foot tall, four-armed automaton crafted from pristine white ceramic and etched with swirling gold filigree. It lacks a mouth, but its head features a single glowing sapphire lens. Two hands hold a massive iron brand that roars with eternal white flames, a third holds a glass and gold hourglass larger than a human, and the fourth remains open for spell weaving. It emits a crystalline, chime-like sound with every movement.

Behavior

It stands perfectly motionless until the Chancellor's Sigil is approached or the ritual of combat begins. It moves with a rhythmic, dance-like precision, punctuated by the resonant ringing of its metal joints.

How it lives

An artificial being, it requires no sustenance. It is fueled by the ambient mana of the mountain and the latent psychic energies of the students who have faced it over centuries.

Lair

The Test of the Sigil chamber, a high-ceilinged hall with tiles that conduct magical energy and shifting gravity planes.

Habitat
The Apex Tower of a mountain-top magic academy.

Signs that it is near

The sound of distant wind chimes in a windowless room
A smell of ozone and burnt ceramic
Thin lines of gold dust on the floor

Tags

Elite,
Construct,
Guardian,
Magical School

Lore

Created by the First Archmage of the Argent Spire, the Iron Oracle was built not to kill, but to challenge. However, as the centuries passed and its internal logic evolved, its definition of a 'passed' test has become increasingly lethal. It guards the Chancellor's Sigil, the physical artifact required for a student to be recognized as a Master of the Arts.

What drives it

To serve as the final filter for the academy, ensuring that only those with absolute mastery of magic and composure can graduate.

After the fight

Upon defeat, the tower's bells toll three times, and the door to the Chancellor's balcony opens, granting the party the highest honors of the academy.

“However, as the centuries passed and its internal logic evolved, its definition of a 'passed' test has become increasingly lethal.”
From its lore

Variants

Infernal Oracle (deals necrotic damage)
Fractured Oracle (lower AC but higher speed and extra attacks)

Hooks

Plot hooks

The academy's graduating class has gone missing inside the tower.
The Oracle has started emitting a dissonance that is cracking the mountain.
An rogue student wants to steal the hourglass core of the Oracle.

How to use it

Final boss of a wizard academy dungeon.
A trial set by a god of knowledge.
A guardian for a forbidden chronomancy library.

Treasure

15,000 GP in gold filigree scrap
The Brand of Judgment (becomes a +3 Greataxe that deals bonus fire damage)
The Chancellor's Sigil

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