
Cathedral of Eternal Night, Healer Guide
Posted 3 years, 11 months ago for patch 7.3 by Preston.
This page covers healer-focused strategies for the bosses in the Cathedral of Eternal Night dungeon. While it's tailored for healers, other roles may also find the information useful. If you have any suggestions or feedback, you can leave a comment below or tweet @PrestonDvorak.
This guide has been updated and maintained based on my own experiences with the fights as well as Dungeon Journal information. I'll continue to update it as-needed.
There is a summary of debuffs to track at the very bottom of the page.
Agronox
During this fight, you will face Agronox and several types of floral adds.
Poisonous Spores deals steadily increasing damage to the group.
- Don't stand in front of the boss to avoid
Timber Smash.
- When affected by
Choking Vines, run away from the source to break the vines.
- If fixated by a Fulminating Lasher, run away from it. Getting caught triggers
Floral Fulmination.
- Avoid the
Toxic Sap puddles left behind when Succulent Lashers are killed.
- On Mythic, Nourishing Lasher need to be killed quickly to mitigate the healing done by
Nature's Infusion.
Healer DBM settings for Agronox
Thrashbite the Scornful
During this fight, you will face Thrashbite and magical books inside a circular library, with the bookshelves playing an important role in the fight.
- The very center of the room is the safest place during this fight, as it helps you avoid several mechanics more easily. The boss should be tanked in the center of the room.
- When
Pulverizing Cudgel is used, run out of the circle around the boss.
- When
Scornful Gaze is used, several things need to happen.
- If you're the target of
Scornful Gaze, run behind one of the bookshelves to avoid the damage from
Scornful Charge.
- If you're not the target, avoid being in the path of the charge, which is denoted by a red line between the boss and the affected player.
- After the charge, don't be in the path of the boss as he runs back to the tank to avoid damage from
Wild Thrash.
- If you're the target of
- Immediately after, move to the center of the room to avoid
Destructive Rampage. The damage area extends slightly beyond the bookshelves, making the circle in the middle the safest place.
- On Mythic, several different book adds will join the fight.
- All books use
Arcane Bolt on their current aggro target.
- Satirical Animated Book
Stifling Satire silences all players when the book spawns.
- Fictional Animated Book
Fettering Fiction slows all players while the book is alive.
- Biographical Animated Book
Beguiling Biography charms a random player. This player must be damaged down to 30% health to break the effect.
- All books use
Healer DBM settings for Thrashbite the Scornful
Domatrax
This is a multi-stage fight during which you fight Domatrax and several types of demon adds while using the Aegis of Aggramar to protect yourself against certain attacks.
- The Aegis of Aggramar creates a circular shield in the center of the room that gets smaller as it absorbs damage from various attacks, explained below, until it eventually disappears.
- Domatrax uses the following abilities during all stages of the fight.
- Don't stand in front of the boss to avoid
Felsoul Cleave. This should also be pointed away from the Aegis of Aggramar to avoid draining it unnecessarily.
- When
Chaotic Energy is used, stand inside the Aegis of Aggramar to mitigate the damage.
- Don't stand in front of the boss to avoid
- Fel Portal Guardians periodically spawn around the edges of the room, and must be killed quickly.
- On Mythic, these channel
Approaching Doom.
- If this channel finishes, a Searing Overfiend emerges from the portal and afflicts the entire group with
Searing Presence.
- If this channel finishes, a Searing Overfiend emerges from the portal and afflicts the entire group with
- On Mythic, these channel
Stage 1 - the march of the felguard
- At 90% health, Domatrax opens two portals allowing Hellblaze Felguards to enter the fight.
- Avoid standing in front of these adds and avoid the puddles left behind by
Searing Rend.
- Avoid standing in front of these adds and avoid the puddles left behind by
Stage 2 - the burning hordes
- At 66% health, three portals are opened allowing Felblaze Feasters and Felblaze Imps to enter the fight.
Stage 3 - the final onslaught
- This stage only occurs on Mythic difficulty.
- At 33% health, four portals are opened allowing Felblaze Mistresses and Felblaze Feasters to enter the fight.
- Felblaze Feasters act the same as in Stage 2.
- Don't stand near Felblaze Mistresses to avoid
Shadow Sweep.
Healer DBM settings for Domatrax
Mephistroth
This is a two-stage fight where you fight against Mephistroth and use the Aegis of Aggramar to defend Illidan.
Stage 1 - mephistroth
- Don't stand in front of the boss to avoid
Carrion Swarm and the resulting puddles.
- When affected by
Demonic Upheaval, move away from other players.
- The resulting fel pillars cast
Blistering Energy on random players.
- The resulting fel pillars cast
- Stay spread out to avoid extra damage from
Dark Solitude.
Stage 2 - fades into shadow
At full energy, Mephistroth casts Shadow Fade, starting Stage 2.
- The group takes steadily increasing damage from
Creeping Shadows.
- Illidan Stormrage appears in the middle of the room and attempts to reveal Mephistroth with
Expel Shadows.
- The tank should pick up the Aegis of Aggramar and use it to protect Illidan from
Shadow Blast orbs.
- DPS should kill the Shadows of Mephistroth around the edges of the room.
- The tank should pick up the Aegis of Aggramar and use it to protect Illidan from
- Dreadwings appear during this Stage as well and cast
Fel Blaze on random players.
Healer DBM settings for Mephistroth
Debuffs to Track
Agronox
Choking Vines causes players to need additional healing.
Thrashbite the Scornful
- (Optional)
Beguiling Biography can be tracked so you know which player is charmed and unable to be healed.
Domatrax
- There are no particular debuffs to track.
Mephistroth
- (Optional)
Dark Solitude can be tracked so you know who will need additional healing from the damage over time effect.
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