Sepulcher of the First Ones Guide

30-second TL;DR

Adventure Guide says

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.
The Adventure Guide lists 11 encounters: Lords of Dread, Vigilant Guardian, Dausegne, the Fallen Oracle, Prototype Pantheon, Lihuvim, Principal Architect, Halondrus the Reclaimer, The Jailer, Skolex, the Insatiable Ravener, Rygelon, Anduin Wrynn, Artificer Xy'mox.

Encounters

Lords of Dread22 abilities · 21 dropsMal'Ganis and Kin'tessa assault players with a combination of decay and shadow magic.

Vigilant Guardian21 abilities · 21 dropsThe Vigilant Guardian will activate Pre-Fabricated Sentries to attack players periodically while employing its own defense routines.

Dausegne, the Fallen Oracle12 abilities · 23 dropsDausegne spends mana to cast spells.

Prototype Pantheon18 abilities · 59 dropsThe Prototype of Duty and the Prototype of War assault players on the ground, using Necrotic Ritual and Pinning Volley.

Lihuvim, Principal Architect17 abilities · 23 dropsAs combat unfolds, Lihuvim accumulates protoform energy.

Halondrus the Reclaimer22 abilities · 23 dropsHalondrus creates Seismic Tremors that release motes of ephemera.

The Jailer35 abilities · 19 dropsThe champions of Azeroth assault the Jailer as he attempts to use the Machine of Origination to remake existence.

Skolex, the Insatiable Ravener15 abilities · 22 dropsSkolex ravages players with its vicious jaws and volatile energies.

Rygelon25 abilities · 19 dropsRygelon gains cosmic energy as the conflict ensues.

Anduin Wrynn26 abilities · 22 dropsAnduin engages players while battling his own domination.

Artificer Xy'mox13 abilities · 22 dropsXy'mox fights players with old tricks and newfound powers alike as he attempts to plunder the Genesis Relic.

Mounts, toys, achievements, transmog

Only rows the journal loot table or an achievement title can prove for this encounter.

Mounts

Zereth Overseer

Achievements

Heroic: Sepulcher of the First Ones · Mythic: Anduin Wrynn · Mythic: Artificer Xy'mox · Mythic: Artificer Xy'mox · Mythic: Lords of Dread · Mythic: Prototype Pantheon · Mythic: Rygelon · Mythic: Sepulcher of the First Ones · Mythic: The Jailer · Mythic: Vigilant Guardian · Sepulcher of the First Ones

Entrance and instance

Sepulcher of the First Ones is a raid in the Adventure Guide. See the Sepulcher of the First Ones database page for the raw journal, map, and loot grid. This guide does not invent coordinates or a walking path.

Player strategy

This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal.

Questions

How many bosses are in Sepulcher of the First Ones?

The Adventure Guide lists 11 encounters.

What loot does Sepulcher of the First Ones drop?

The journal lists 274 drops across its encounters. Open a boss guide or the database page for the per-encounter tables.

Is this the Sepulcher of the First Ones database page?

No. This is the encounter guide. The encyclopedia page with the raw journal tree and the full loot grid is linked as Database on this page.

Where does this guide's text come from?

Quoted Adventure Guide sections come from TheWoWDB's retail datamine (client build 12.1.0.69587, ingested 2026-09-01). We do not invent positioning, assignments, or cooldown timings.

Source and build

This page quotes the Adventure Guide. It does not add player strategy such as positioning, assignments, stack or spread calls, or cooldown timings unless that sentence is already in the journal. Quoted sections come from TheWoWDB Adventure Guide datamine (client build 12.1.0.69587, ingested 2026-09-01). Ability names link to first-party spell pages. When a newer retail build is ingested, this page updates with it.