De Other Side, Healer Guide
Updated 2 weeks, 5 days ago for patch 9.2 by Preston. View the change log.
This page covers healer-focused strategies for De Other Side dungeon in Shadowlands. 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 as well as Dungeon Journal and combat log information. I'll continue to update it as-needed.
Bosses
Below are guides for the bosses in De Other Side, including their abilities, healer notes, and addon settings.
Hakkar the Soulflayer
- The tank will be dealing with
Piercing Barb. 
Blood Barrier deals moderate damage to all players and Sons of Hakkar, granting Hakkar a damage absorption shield equal to the damage dealt and making him immune to interrupts while the shield is active.
- Avoid the impact locations of
Blood Barrage - Interrupt the channeled cast as soon as the damage shield is depleted.
- Avoid the impact locations of
- Stay at least 7-yards away from other players to prevent the spread of
Corrupted Blood. - Son of Hakkar will periodically join the encounter.
- Son of Hakkar
- Fixate on random players with
Zealous. - Deal steadily increasing damage to all players with
Blood Nova. - Upon death, avoid the
Spilled Essence pool.
- The pool gradually shrinks while healing the Son of Hakkar that spawned it. The Son of Hakkar will become active again at full health.
- On Mythic, the pool no longer shrinks.
- The pool gradually shrinks while healing the Son of Hakkar that spawned it. The Son of Hakkar will become active again at full health.
- Fixate on random players with
- Son of Hakkar
Healing Notes
- Use cooldowns as-needed if Corrupted Blood or Sons of Hakkar gets out of hand.
Debuffs to Track
- Major: Corrupted Blood
- Minor: Zealous
Addons
The Manastorms
During this encounter, players will alternate between fighting a Manastorm in the arena while the other assaults from afar.
Stage One - Millhouse's Magics
During this stage, Millhouse is in the arena with Millificent on the sidelines.
- Millhouse Manastorm
- Interrupt
Frostbolt to prevent the damage dealt, especially while 
Chilled Heart is active. - Intercept the
Power Overwhelming beams coming from the Power Crystals to Millhouse.
- The player(s) intercepting the beams take steadily increasing damage over time while gaining a stacking damage dealt increase.
- Each second the beam hits Millhouse,
Overwhelming Power! deals light damage to all players and grants him a stacking damage dealt buff.
- On Mythic,
Diabolical Dooooooom! deals critical damage to all players over 15-seconds.
- To interrupt this, Millhouse should be stunned with the
Echo Finger Laser X-treme beam, detailed below.
- To interrupt this, Millhouse should be stunned with the
- Interrupt
- Millificent Manastorm
- Targets random players with
Throw Buzz-Saw, dealing moderate damage and applying a stack of 
Bleeding, dealing further light damage over time. - On Mythic, when targeted by Echo Finger Laser X-treme, stand so Millhouse is between you and another targeted player to stun him with
Eruption, interrupting Diabolical Dooooooom!.
- Targets random players with
Stage Two - Millificent's Gadgets
During this stage, Millificent is in the arena with Millhouse on the sidelines.
- Millificent Manastorm
- The tank will be dealing with Buzz-Saw and stacks of Bleeding.
- Dismantle
Experimental Squirrel Bombs by right-clicking on them to prevent the moderate damage dealt to all players when they detonate.
- Dismantling a Bomb spawns several
Mechanical Bomb Squirrels that deal light damage to random players.
- Dismantling a Bomb spawns several
- On Mythic,
Aerial Rocket Chicken Barrage deals moderate damage over time to all players.
- The tank will be dealing with
- Millhouse Manastorm
- Targets random players with Frostbolt.
- On Mythic, when targeted by
Shadowfury, move within 8-yards of Millificent to stun her, this is especially important to interrupt Aerial Rocket Chicken Barrage.
- Targets random players with
Healing Notes
- The player(s) absorbing Power Overwhelming may need an external defensive cooldown to survive the damage.
- Use minor cooldowns as-needed if Experimental Squirrel Bombs aren't dismantled or if Bleeding stacks get too high.
- On Mythic, use major cooldowns to survive the initial ticks of Aerial Rocket Chicken Barrage.
Debuffs to Track
- Major: Power Overwhelming
- Minor: Echo Finger Laser X-treme, Bleeding
Addons
Dealer Xy'exa
- Avoid the locations of
Displacement Traps.
- Hitting a trap deals light damage to all players within 10-yards and teleports the triggering player 25-yards into the air.
- When affected by
Localized Explosive Contrivance, run over a Displacement Trap to be teleported in the air just before the effect expires to avoid damaging all players.
- If the affected player doesn't trigger a trap properly, all players gain a stack of
Localized Explosive Contrivance, dealing light damage over time.
- If the affected player doesn't trigger a trap properly, all players gain a stack of
- Just before Explosive Contrivance finishes casting, run over a Displacement Trap to be teleported into the air to avoid the moderate damage.
- Any player that doesn't trigger a trap properly also gains a stack of Explosive Contrivance, dealing light damage over time.
- Any player that doesn't trigger a trap properly also gains a stack of
- Avoid the path of
Displaced Blastwave beams from portals spawned near random players. - On Mythic, targets a random player with
Arcane Lightning, dealing light damage over time and applying stacks of 
Arcane Vulnerability.
- Upon expiring, this jumps to the next closest player.
Healing Notes
- Use cooldowns as-needed to make sure players have enough health to survive triggering a Displacement Trap.
Debuffs to Track
- Major: Arcane Lightning, Arcane Vulnerability
- Minor: Localized Explosive Contrivance
Addons
Mueh'zala
During this encounter, players alternate between the two stages as they work to free Bwonsamdi.
Stage One - The Master of Death
This stage begins the encounter and ends when 
Shatter Reality is cast and players travel through 
Deathgates. This stage begins again after 25-seconds in stage two.
- The tank will be dealing with
Soulcrusher, which deals heavy damage over time from Crushed Soul. - Dispel
Cosmic Artifice (magic) and avoid the 
Cosmic Collapse left behind.
- If this expires instead of being dispelled,
Unbound Cosmos deals light damage to all players. - On Mythic, this is applied to four players at once and you should aim to dispel it from as many players as possible.
- If this expires instead of being dispelled,
- Avoid the sequence of areas hit by
Master of Death.
- There are three areas that will be hit: Left, Right, and Melee (as you're facing the boss).
- Each area will only be hit once per sequence.
- The area to be hit is dictated by which hand Mueh'zala is casting with, if both hands are casting, the Melee area will be hit.
- If no players are within melee range,
Crush deals heavy damage to all players.
- Additionally, any players not on the same platform as Mueh'zala take heavy damage over time from Stellar Cloud.
- Additionally, any players not on the same platform as Mueh'zala take heavy damage over time from
- When
Shatter Reality is cast, run into one of the 
Deathgates spawned on either side of Mueh'zala or near the stairways.
- As a healer, you should generally take the same portal as the tank.
Stage Two - Shattered Reality
This stage begins when players travel through the Deathgates and ends after 25-seconds. It begins again each time players travel through the Deathgates.
- Players have 25-seconds to interact with Mueh'zala's Primeval Grasp totems before
Coalescing pulls them back to reality.
- Each totem is guarded by a Shattered Visage.
- Shattered Visage
- Avoid the locations of Cosmic Artifice, similar to stage one.
- Deals light damage to all players with
Shattered Dominion.
- Avoid the locations of
- Shattered Visage
- Once the Shattered Visage is killed, interacting with the nearby totem triggers
Mojo Infusion.
- Deals 20% of Mueh'zala's health as damage with
Bwonsamdi's Fury. - Grants players a stack of
Bwonsamdi's Fervor, increasing haste and movement speed.
- Deals 20% of Mueh'zala's health as damage with
- Each totem is guarded by a Shattered Visage.
Healing Notes
- The tank may need external defensive cooldowns to survive Crushed Soul.
Debuffs to Track
- Major: Crushed Soul, Cosmic Artifice (dispel, magic)
- Minor: Master of Death
Addons
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Trash Mobs
Below are notes for the trash mobs in De Other Side. De Other Side has a relatively open layout with the choice of what order to clear the first three wings. The trash below is grouped based on the different wings that are available.
Central Wing
- Risen Cultist
- Interrupt or avoid the locations of
Dark Lotus.
- Interrupt or avoid the locations of
- Risen Bonesoldier
- Don't stand in front to avoid
Trollguard.
- Don't stand in front to avoid
- Risen Warlord
- Soothe
Undying Rage (enrage) to remove the increased damage dealt effect and allow the mob to be killed. - Avoid the locations of Reaver.
- Soothe
- Skeletal Raptor
- Applies stacks of
Decrepit Bite to tank, dealing light damage over time.
- Applies stacks of
- Death Speaker
- Interrupt
Shadowcore to prevent the moderate damage dealt to the tank. - When possible, interrupt or purge
Death's Embrace to prevent the increased haste effect. - Don't stand in front when it turns to cast
Erupting Darkness.
- Interrupt
- Enraged Spirit
- Avoid the locations of
Enraged Masks. - Deals moderate damage over time to all players with
Rage.
- Avoid the locations of
Hakkar the Soulflayer's Wing (Shrine of the Soulflayer)
- Atal'ai High Priest
- Dispel
Shadow Word: Pain (magic) to prevent the light damage over time.
- Dispel
- Atal'ai Devoted
- Should be killed before their
Devoted Sacrifice cast finishes, turning them into Son of Hakkar.
- Son of Hakkar
- Fixate on random players with Zealous.
- Deal steadily increasing damage to all players with Blood Nova.
- Upon death, avoid the Spilled Essence pool left behind.
- Fixate on random players with
- Son of Hakkar
- Should be killed before their
- Atal'ai Deathwalker
- Applies stacks of
Gushing Wound to the tank, dealing light damage over time. - Stay at least 5-yards away to avoid
Bladestorm. - Upon death, spawn an Atal'ai Deathwalker's Spirit that fixates on a random player, dealing moderate damage with melee attacks.
- Applies stacks of
- Atal'ai Hoodoo Hexxer
- Interrupt
Healing Wave to prevent the healing. - Interrupt or dispel
Hex (magic) to prevent the incapacitating effect. - Interrupt
Lightning Discharge or when affected move at least 8-yards away from other players to prevent chaining the damage.
- Interrupt
The Manastorms' Wing (The Heap)
- Defunct Dental Drill
- When
Haywire is cast, break line of sight to avoid the heavy damage dealt.
- When
- 4.RF-4.RF
- When affected by
W-00F, stay at least 8-yards away from other players.
- When affected by
- Headless Client
- During
Spinning Up, stay at least 5-yards away. Damaging the mob causes it to be knocked away. - When possible, purge
Additional Threads to remove the increased movement speed effect.
- During
- Volatile Memory
- Stay at least 10-yards away to avoid
Volatile Capacitor.
- Stay at least 10-yards away to avoid
- Lubricator
- Interrupt
Self-Cleaning Cycle to prevent the healing over time. - Interrupt
Lubricate to prevent the moderate damage dealt to all players and the reduced chance to hit effect.
- Interrupt
- There is a short gauntlet players must traverse by avoiding the flow of Experimental Sludge oozes.
- Players hit take moderate damage and have movement speed decreased from
Icky Sticky.
- Players hit take moderate damage and have movement speed decreased from
- Sentient Oil
- Deals light damage to random players with
Essential Oil. - Targets random players with
Sludgegrab, pulling them into melee range and rooting them in place.
- Deals light damage to random players with
- There is another short gauntlet players much traverse while avoiding sludge from the two sludge vents along the narrow walkway.
- Being hit by the sludge will knock the player off the walkway, killing them.
Dealer Xy'exa's Wing (Hidden Glade)
- Avoid the impact locations of
Malefic Blast being shot from the walls of the first hallway. - Weald Shimmermoth
- Dispel
Soporific Shimmerdust (curse) to prevent the accumulation of 
Soporific Shimmerdust (dispel, curse) stacks.
- Players can jump to remove stacks of Soporific Shimmerdust.
- At 10 stacks, the affected player is put to sleep by
Shimmerdust Sleep (dispel, magic).
- Players can jump to remove stacks of
- Dispel
- Runestag Elderhorn
- Avoid the impact locations of Anima Starstorm.
- Avoid the impact locations of
- Spriggan Barkbinder
- Interrupt or purge
Bark Armor to prevent the damage absorption effect. - Avoid the location of
Pacifying Mists.
- Interrupt or purge
- Mythresh, Sky's Talons
- Stay at least 5-yards away to avoid
Wailing Grief (dispel, magic).
- Stay at least 5-yards away to avoid
- Bladebeak Matriarch
- Soothe Enrage from Angering Shriek to remove the increased damage dealt effect.
- Soothe
- Territorial Bladebeak
- Applies
Beak Slice to the tank, increasing the damage taken from subsequent Beak Slices.
- Applies
- Bladebeak Hatchling
- Call nearby Bladebeaks to their aid with
Frightened Cries.
- Call nearby Bladebeaks to their aid with
Trash Debuffs to Track
- Major:
- Magic Dispel: Wailing Grief (dispel, magic), Hex (dispel, magic), Shimmerdust Sleep (dispel, magic)
- Damaging: Beak Slice
- Magic Dispel:
- Minor:
- Magic Dispel: Shadow Word: Pain (dispel, magic)
- Curse Dispel: Soporific Shimmerdust (dispel, curse), Soporific Shimmerdust (dispel, curse)
- Damaging: Decrepit Bite, W-00F, Gushing Wound, Lightning Discharge
- Magic Dispel:
- Enrages to Soothe: Undying Rage, Enrage
- Buffs to Purge: Death's Embrace, Bark Armor, Additional Threads
Trash Addons
Mythic+ Notes
Below are notes that pertain to high mythic+ levels and certain affixes. What constitutes a high mythic+ level will depend on your gear and group, so if you out-gear a particular mythic+ level these notes may not apply. The notes are grouped by affix but are in no particular order.
Tyrannical
- The Manastorms
- The tank will need heavy healing and external defensive cooldowns when dealing with high stacks of Bleeding.
- The tank will need heavy healing and external defensive cooldowns when dealing with high stacks of
- Mueh'zala
- The tank will need heavy healing and external defensive cooldowns when dealing with Crushed Soul.
- The tank will need heavy healing and external defensive cooldowns when dealing with
- The Manastorms
Fortified
- Enraged Spirit
- Rage will require cooldowns to survive.
- Defunct Dental Drill
- Breaking line of sight during Haywire will be explicitly required.
- Breaking line of sight during
- Territorial Bladebeak
- Deals heavy damage to the tank with Beak Slice.
- Deals heavy damage to the tank with
- Enraged Spirit
Sanguine
Bolstering
- No exceptional interactions noted yet!
Grievous
- No exceptional interactions noted yet!
Raging
Videos
Mythic 17 +1 Clear, Restoration Druid PoV
Below is a video of me clearing De Other Side on Mythic 17 difficulty in time for a +1 upgrade during Season 1 of Shadowlands.
Mythic 0 Clear, Restoration Druid PoV
Below is a video of me clearing De Other Side on Mythic 0 difficulty.
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