Sepulcher of the First Ones

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Boss abilities and loot tables from Blizzard's own journal, boss by boss.

The Jailer has breached the Sepulcher, the mysterious heart of the Shadowlands. Should he control its primordial power, he will reshape the cosmos with Death at the fore. As Zovaal prepares to dominate reality, champions of Azeroth charge forth to stop him. Will their resolve outmatch his?

Written notes for this instance are a later milestone. Everything on this page comes from Blizzard's journal data.

Expansion: Shadowlands
Minimum Level: 60
Modes: Raid Finder, Normal, Heroic, Mythic

Bosses

1. Vigilant Guardian

This eternal guardian lies in wait, keeping a timeless vigil over the entrance to the Sepulcher of the First Ones.

Abilities

Overview
The Vigilant Guardian will activate Pre-Fabricated Sentries to attack players periodically while employing its own defense routines. Throughout the encounter the Vigilant Guardian will [Expose] its core, inflicting lethal damage to all players not shielded by an Automated Defense Matrix. When automa are defeated, their energy is automatically redistributed to the next largest [Powered Down] auto
Automa
The Vigilant Guardian is aided by various automa. Automa are [Powered Down] until restored to full power. When Automa are defeated their power is redistributed to the next largest automa nearby that is still [Powered Down].
Stage One: Systems Online!
The Vigilant Guardian begins the encounter protected by the gateway to the Sepulcher of the First Ones. [Detonating] an [Unstable Core] nearby will damage the Vigilant Guardian.
Stage Two: Roll Out, then Transform
Once the Vigilant Guardian reaches 40% health remaining it rolls forward and then transforms into its battle mode.
Stage Three: Self-Destruct Sequence
At 15% health remaining, the Vigilant Guardian activates its self-destruct sequence.

Loot

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2. Skolex, the Insatiable Ravener

With the Sepulcher of the First Ones vulnerable, devourers swarm in to feed their hunger. Among these aberrations is the ravenous Skolex. As the great worm consumes vast amounts of ephemera, the Sepulcher is thrown out of balance and threatens to collapse upon itself.

Abilities

Overview
Skolex ravages players with its vicious jaws and volatile energies. The great worm's thrashings apply increasing applications of [Ephemera Dust]. with [Ravening Burrow], devour all [Ephemera Dust], and gain an application of [Insatiable].
Ravening Burrow
Dust Flail
Dust Blast
Dust Blast
Dust Blast

Loot

Showing the first 20 of 22 items. Open The Boss Page

3. Artificer Xy'mox

After his defeat in Castle Nathria, Artificer Xy'mox sank back into the shadows to plot his next heist. With the Sepulcher of the First Ones now vulnerable, Xy'mox has summoned the full might of the Xy Cartel to plunder the ancient knowledge and powerful relics buried there.

Abilities

Overview
Xy'mox fights players with old tricks and newfound powers alike as he attempts to plunder the Genesis Relic. At 75% and 50% health remaining, Xy'mox will call in Xy reinforcements to assault players as he unlocks more of the artifact's power with [Decipher Relic]. Once the Xy reinforcements are defeated, the relic begins to radiate [Genesis Rings] in new combinations.
Genesis Relic
A mysterious Progenitor relic hidden deep within the Sepulcher of the First Ones.
Stage One: Cartel Xy
Stage Two: Secrets of the Relic
Xy'mox calls in the might of Cartel Xy as he attempts to unlock the secrets of the relic.

Loot

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4. Dausegne, the Fallen Oracle

Dominated by the Jailer, Dausegne leads the Mawsworn in a battle to gain control of the Forge of Afterlives. The Jailer plans to use its power to unleash an eternity of torment upon all of reality.

Abilities

Overview
Dausegne spends mana to cast spells. Upon reaching 0 mana, she will drain energy from a Reservoir of the First Ones to shield herself and dominate the reservoir by channeling [Inevitable Dominion]. Dominated reservoirs empower Dausegne's casts of [Disintegration Halo], spawning one Halo for every reservoir that has been dominated. If all reservoirs have been Dominated when Dausegne runs out o
Disintegration Halo
Disintegration Halo
Domination Core
Staggering Barrage
Staggering Barrage

Loot

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5. Prototype Pantheon

Bereft of the cosmic spirits of the Eternal Ones, these incomplete host bodies can only carry out their base directives without mercy or compassion. With the enemy at the gates, Lihuvim has little choice but to activate these dangerous prototypes.

Abilities

Overview
The Prototype of Duty and the Prototype of War assault players on the ground, using [Necrotic Ritual] and [Pinning Volley]. If a member of the Prototype Pantheon reaches 40% health remaining, they all retreat to the Progenitor Forge as [Reconstruction] begins, ushering other Prototype Pantheon members into the fight. The Prototype of Absolution and the Prototype of Renewal then assault playe
Stage One: War and Duty
If the Prototype of War or the Prototype of Duty reaches 40% health remaining, both retreat to the Progenitor Forge. The Prototype of Absolution and the Prototype of Renewal then begin their assault upon players.
Stage Two: Sin and Seed
If the Prototype of Absolution or the Prototype of Renewal reaches 40% health remaining, both Pantheon members retreat to the Progenitor Forge. All members of the Pantheon of Death then continue the assault upon players for a final showdown.
Stage Three: Pantheon of Death
The Pantheon of Death enters the fight for a final showdown.

Loot

Showing the first 20 of 59 items. Open The Boss Page

6. Lihuvim, Principal Architect

With meticulous care, Lihuvim weaves ephemera into being in accordance with the hallowed will of the First Ones. Now this process is threatened as Mawsworn forces seek to claim this power.

Abilities

Overview
As combat unfolds, Lihuvim accumulates protoform energy. Upon reaching 100 energy, Lihuvim casts [Synthesize] which allows nearby protoform lattices to be destroyed. Any remaining lattices are transformed into Protoform Automa when the synthesis completes.
Manifest Mote
Deconstructing Energy
Cosmic Shift
Cosmic Shift
Alignment Shift

Loot

Showing the first 20 of 23 items. Open The Boss Page

7. Halondrus the Reclaimer

For eons Halondrus traversed the cliffs of the Sepulcher of the First Ones, fulfilling its sacred purpose of reclaiming ephemera and returning it to the great cycle. With intruders now throwing this pattern into anarchy, the ancient keeper will do whatever it must to maintain order.

Abilities

Overview
Halondrus creates [Seismic Tremors] that release motes of ephemera. If any motes reach Halondrus, an [Ephemeral Eruption] occurs. At 100 energy Halondrus casts [Reclaim] and pulls in motes with increasing force. Upon reaching 78% and 45% health remaining Halondrus descends further into the Shimmering Cliffs to discover a new location brimming with ephemera.
Volatile Charges
Stage One: The Reclaimer
Stage Two: The Shimmering Cliffs
Stage Three: A Broken Cycle

Loot

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8. Anduin Wrynn

Controlled by Domination magic, Anduin is being forced to aid the Jailer's plan to remake reality. As time runs out to stop him, the champions of Azeroth must make a difficult choice: defeat the young king to save the cosmos, or risk everything in order to restore his soul.

Abilities

Overview
Anduin engages players while battling his own domination. Anduin's [Kingsmourne Hungers] separates players from their souls, allowing them to aid Anduin's true self and restore his [Willpower]. Throughout the encounter, Anduin temporarily manifests the source of his domination. This manifestation is linked to him by [Domination's Grasp].
Stage One: Kingsmourne Hungers
Intermission: A Fallen King
Stage Two: Grim Reflections
Intermission: March of the Damned
Stage Three: A Moment of Clarity

Loot

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9. Lords of Dread

Using subterfuge and guile, the nathrezim have worked for eons to bring the Jailer's plan to fruition. Now, on the brink of their master's victory, they only need to complete one final task to ensure none are left to resist the new order of the cosmos.

Abilities

Overview
Mal'Ganis and Kin'tessa assault players with a combination of decay and shadow magic. When Mal'Ganis reaches 100 energy, he signals both dreadlords to dissolve into their swarm forms and inflict high damage to all players with [Swarm of Decay] and [Swarm of Darkness]. When Kin'tessa reaches 100 energy, she signals both dreadlords to vanish and infiltrate the raid, deceiving their minds with
Mal'Ganis
Kin'tessa

Loot

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10. Rygelon

Drawn to observe the fateful events unfolding within the Sepulcher of the First Ones, Rygelon succumbed to the Jailer's domination. Now this constellar turns its cosmic power against any who would oppose the Banished One.

Abilities

Overview
Rygelon gains cosmic energy as the conflict ensues. At 100 cosmic energy, Rygelon begins to cast [Massive Bang], killing all players outside of [The Singularity]. Destroying [Unstable Matter] grants access into The Singularity through [Unstable Matter Field]s. After expending its cosmic energy inside The Singularity, Rygelon casts [Shatter Sphere] on a remaining [Unstable Antimatter], returning
Rygelon
Unstable Matter
Unstable Matter
Unstable Matter
The Singularity
Corrupted remnants of previous Cosmic Cores. Upon destruction the Unstable Core casts Gravitational Collapse.

Loot

11. The Jailer

For untold millennia, the Jailer patiently unfolded his plan to reach the heart of the Sepulcher. Now poised upon the precipice of his final victory, the heroes of Azeroth must rally to prevent the Jailer from dominating all of reality.

Abilities

Overview
The champions of Azeroth assault the Jailer as he attempts to use the Machine of Origination to remake existence. The Jailer starts the battle by asserting control over the machine's Control Pylons using [Relentless Domination]. Once all Control Pylons have been brought under his control, the Jailer begins an [Unholy Attunement] in an attempt to activate the machine. The force of [Shattering
Stage One: Origin of Domination
Stage Two: Unholy Attunement
Stage Three: Eternity's End

Loot

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Data from patch 12.1.0. Game data provided by Blizzard Entertainment through the Battle.net API.