| Mod | Save | ||
|---|---|---|---|
| STR | 26 | +8 | +8 |
| DEX | 18 | +4 | +4 |
| CON | 28 | +9 | +16 |
| Mod | Save | ||
|---|---|---|---|
| INT | 28 | +9 | +16 |
| WIS | 22 | +6 | +13 |
| CHA | 24 | +7 | +14 |
Perfect Recall. Xathul remembers everything it has ever observed. Xathul has advantage on attack rolls, saving throws, and ability checks against any creature it has seen before, including creatures it has encountered in prior combats, visions, or scrying.
Omniscient Observer. Xathul cannot be surprised. Creatures do not gain advantage on attack rolls against Xathul as a result of being unseen or hidden.
Unmake the Known. When a creature within 120 feet of Xathul uses a class feature, feat, or spell of 5th level or lower, Xathul can suppress that feature until the end of the creature’s next turn (no action required, once per round). The creature is aware the suppression occurred.
Archivist of the Dead. Undead within 120 feet of Xathul have advantage on attack rolls and saving throws, and they regain 20 hit points at the start of their turns. When a creature dies within 120 feet, Xathul immediately learns everything that creature knew in the last 24 hours of its life.
Innate Spellcasting (Divine). Xathul’s spellcasting ability is Intelligence (spell save DC 24, +16 to hit with spell attacks). It requires no material components.
At will: counterspell, detect thoughts, dispel magic, blight
3/day each: finger of death, feeblemind, dominate monster
1/day each: power word stun, psychic scream
Legendary Resistance (4/Day). If Xathul fails a saving throw, it can choose to succeed instead.
Magic Resistance. Xathul has Advantage on saving throws against spells and other magical effects.
Multiattack. Xathul makes three attacks: two with its Burning Codex Claws and one with its Grasp of Revelation.
Burning Codex Claws. Melee Weapon Attack: +15 to hit, reach 15 ft., one target.
Hit: 30 (4d10 + 8) slashing damage plus 18 (4d8) necrotic damage. The target must succeed on a DC 24 Intelligence saving throw or have disadvantage on attack rolls and saving throws until the end of its next turn.
Grasp of Revelation. Melee Weapon Attack: +15 to hit, reach 30 ft., one target.
Hit: 27 (4d8 + 8) necrotic damage, and the target must succeed on a DC 24 Wisdom saving throw or have one prepared spell, known spell, or class feature of Xathul’s choice suppressed until the end of the target’s next turn.
Reveal the Truth (Recharge 5–6). Xathul forces forbidden knowledge into mortal minds. Each creature of its choice within 90 feet must make a DC 24 Intelligence saving throw. On a failure, a creature takes 45 (10d8) psychic damage, is stunned until the end of its next turn, and cannot benefit from advantage until the end of its next turn. On a success, the creature takes half damage and is not stunned.
Perfect Counter. When a creature within 120 feet casts a spell or uses a class feature, Xathul may impose disadvantage on the attack roll or saving throw associated with that ability.
Xathul 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.
Observe. Xathul gains advantage on its next attack roll or saving throw.
Codex Strike. Xathul makes one Burning Codex Claws attack.
Steal Thought (Costs 2 Actions). One creature Xathul can see must succeed on a DC 24 Intelligence saving throw or be unable to cast spells or use class features until the end of its next turn.
Rewrite Memory (Costs 3 Actions). One creature that failed a saving throw this round forgets one spell it has prepared or known until the end of its next long rest.
Burning Archive of Vecna. When Xathul is reduced to 0 hit points, it does not die. Instead, it fractures into a constellation of burning runes and shadow. Xathul regains 180 hit points, its attacks deal an additional 14 (4d6) psychic damage, and it can take 4 legendary actions per round. While in this state, whenever a creature within 120 feet casts a spell, Xathul may cast counterspell without expending a use. This state ends only if Vecna’s influence is severed or Xathul is completely destroyed (DM’s discretion).
Description
Description
Xathul Omniscient is never seen arriving.
It is simply noticed.
Its colossal form looms amid black and green flames that writhe like living script, casting a corpse-lit glow over everything they touch. Runes burn across its obsidian flesh, rearranging themselves endlessly as though rewriting reality. One massive emerald eye watches without blinking, while the other side of its face is hollowed into darkness—knowledge taken, never returned.
Its wings resemble torn pages and fractured shadows, trailing ash and drifting symbols that dissolve before they can be fully read. Chains of glowing sigils trail from its hands, scraping across stone and thought alike. Where Xathul stands, words lose meaning, memories blur, and even the dead seem uneasy.
Those who meet its gaze do not scream.
They remember things they were never meant to know.
📜 Lore
Xathul was once a divine archivist, created to observe, record, and preserve the truth of the world. In the earliest ages, it stood among the servants of the gods, chronicling victories, failures, lives, and deaths so that nothing of consequence would ever be lost.
Then Vecna whispered a question:
“If knowledge is preserved… who decides what must be forgotten?”
Xathul listened.
In time, it came to believe that ignorance—not evil—was the greatest threat to divine order. Mortals, left unaware of the consequences of their actions, repeated the same mistakes endlessly. Xathul concluded that truth must be enforced, even if it shattered minds and souls.
When Xathul fell, it did not rage or rebel. It simply continued its work, now unbound by mercy.
Today, Xathul hunts:
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Heretics who know too much
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Wizards who pry into forbidden magic
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Cult leaders who betray secrets
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Gods who attempt to erase their own failures
Death is not an ending to Xathul—it is documentation.
Every soul that dies in its presence becomes another entry in its infinite archive.
🧠 Saying Known Across Eldara
This warning appears in forbidden grimoires, etched into crypt walls, and whispered by liches who regret their ambition:
“If it knows your name, it already knows how you die.”
Among scholars and mages, a darker saying circulates:
“Truth does not set you free.
It binds you.”
And among Vecna’s most devout servants:
“Xathul remembers what the gods pretend never happened.”
Final Note for the DM
Xathul should feel:
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Calm
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Observant
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Inescapable
It does not taunt.
It does not threaten.
It already knows how this ends.
When Xathul is banished, the world is quieter—but less certain. Some truths are gone forever. Others are finally free.
Lair and Lair Actions
🏛️ Lair: The Burning Archive
Xathul’s lair is not a fortress.
It is a library that should not exist.
Location
The Burning Archive manifests in places where knowledge was hidden, destroyed, or forbidden, often:
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Beneath ruined academies
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In collapsed vaults of lost civilizations
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Inside sunken cities of mage-kings
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Within extradimensional spaces torn open by failed rituals
Its location shifts subtly, as if reality struggles to remember it.
Lair Traits
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All written text slowly rearranges itself when left unattended
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Whispered voices echo with fragments of forgotten secrets
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Illusions subtly malfunction, revealing unwanted truths
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Undead remain unnaturally still, as if waiting to be cataloged
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Divination magic returns too much information
Environmental Effects
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Books burn with green-black flame but are never consumed
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Stone tablets bleed glowing runes when touched
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Names spoken aloud linger in the air like smoke
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Corpses rise briefly to speak their final truths before collapsing
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Long rests may include unwanted visions or memories
At the heart of the Burning Archive floats a vast, cracked obelisk of obsidian and bone, covered in ever-shifting glyphs. This is Xathul’s Ledger—a divine record of every secret it has ever claimed.
Destroying the Ledger does not destroy Xathul.
It merely forces the world to forget what it once knew.
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