ESO Dread Cellar Guide | Veteran, Hardmode and Secret Bosses

Deltia

Hey all,

Below is my written guide for the latest dungeon for Waking Flame DLC. You can find the full post on my website here.

Welcome to the written guide for the Dread Cellar Dungeon which includes Veteran, Hard Modes and all the Secret bosses. This will cover all the mechanics for the dungeons along with pictures for important aspects of completing the dungeon.  This was added in ESO Update 31 and comes with very good gear to collect and is one of the most challenging dungeons to date!

Table of Contents

• Video Guide
• About This Dungeon
• Gear
• Secret Bosses
• Purgator
• Undertaker
• Grim Warden
• Main Bosses
• Scorion Broodlord
• Cyronin Artellian
• Magma Incarnate
• Summary

Video Guide for Dread Cellar Dungeon
https://youtu.be/bwiFJrvVTpA

About The Dread Cellar Dungeon

The Dread Cellar dungeon contains three main bosses and three secret bosses.  Each main boss has a hard mode that you can activate which you'll need to complete each subsequent hard mode if your goal is to finish all the hard modes in the dungeons.

This dungeon is also compromised of three secret bosses each granting a special buff that remains with you throughout the instance.  You can use a synergy after you've obtained the secret bosses and summon them to your aid for one minute during the fight.  It's highly recommended you do all three secret bosses if your goal is to complete all hard modes, as they are extremely challenging without the buffs.

Accessing the Trap Doors
Step 1: access the trap door via acquiring two-four braziers with the synergy key.  Deposit each brazier and gain access to the secret boss.  
Braziers
Synergy
Trap Door


Step 2: you'll need to simultaneously activate crystals in order for a portal to spawn allowing you entrance in the secret boss area.
Shard
Portal

Step 3: grab two more braziers and place at each crystal in order to unlock the boss fight.  Kill the boss in order to given their buff along with the ability to summon them in subsequent boss fights.

Portal
Available buffs
Purgator's Accession Increase Weapon and Spell Damage by 300. Activating Purgator's Guardian Stone summons Purgator for 1 minute, resurrects allies and shields allies with Bolster. With Purgator active, light, medium, heay and bast attacks amplify this effect by granting stacks of heating up. These hits also trigger searing sting which deals 50% additional fire damage.
Undertaker's Accession Magcika and stamina recovery increased by 200. Activating Undertaker's Guardian Stone summons Undertaker's for 1 minute, resurrects allies and shields allies with Bolster. With Undertaker active: light, medium, heavy and bash attacks amplify this effect and boost movement speed with Gravewalker. These hits also stack siphon Essence which siphons health from targets.
Grim Warden's Accession Max health increased by 2000. Activating Grim Warden's Guardian Stone summons Grim Warden for 1 minute and resurrects allies. With Grim Warden active: light, medium, heavy and bash attacks generate ultimate and apply stacks of Warding Aria which reduces damage taken.

GEAR SETS
Scorion’s Feast (Light Armor)

• (2 items) Adds 1096 Maximum Magicka
• (3 items) Adds 129 Magicka Recovery
• (4 items) Adds 129 Weapon Damage and Spell Damage
• (5 items) When you deal damage with a fully-charged Heavy Attack, you gain an Imbued Aura for 10 seconds, granting you and up to 3 other group members 307 Magicka and Stamina Recovery. This effect can occur once every 20 seconds. If you deal damage with a fully-charged Heavy Attack with an Imbued Aura active, consume it and gain an Overflow Aura for 10 seconds, granting you and up to 3 other group members 307 Weapon Damage and Spell Damage.

Rush of Agony (Medium Armor)

• (2 items) Adds 129 Stamina Recovery
• (3 items) Adds 129 Weapon Damage and Spell Damage
• (4 items) Adds 1487 Offensive Penetration
• (5 items) When you deal direct damage with a Blink, Charge, Leap, Teleport, or Pull ability, pull enemies within 10 meters to you. After 2 seconds, deal 1790 Physical Damage to all enemies within 7 meters. This effect can occur once every 8 seconds and scales off the higher of your Weapon or Spell Damage. The pull will not apply Crowd Control Immunity to a target.

Crimson Oath’s Rive (Heavy Armor)

• (2 items) Adds 1487 Armor
• (3 items) Adds 1206 Maximum Health
• (4 items) Adds 1487 Armor
• (5 items) When you use an ability that applies a Major or Minor buff to yourself or an ally, send out a wave of energy that reduces the Armor of nearby enemies within 12 meters by 3541 for 15 seconds. This effect can occur once every 12 seconds, and will only occur if an enemy is within range.

Magma Incarnate (Monster Helm)

• (1 item) Adds 129 Magicka Recovery, Adds 129 Stamina Recovery
• (2 items) When you heal yourself or a group member with a single target heal ability, grant the lowest Health group member within 28 meters Minor Courage and Minor Resolve, increasing their Weapon Damage and Spell Damage by 215 and Armor by 2974 for 10 seconds. Daedric Energy will then bounce to a nearby group member within 8 meters, up to 3 times, applying Minor Courage and Minor Resolve for 10 seconds. This effect can occur once every 15 seconds.

Secret Bosses
Purgator
Secret Entrance Map 1
Secret Entrance Map 2

• Health = 3,740,235
• Additional Enemies: Flame Atronachs
• Access: You'll need to access braziers and bring to the trap door shown in the picture below, along with simultaneously clicking the crystals also shown below.
• Mechanics: this mini boss is very easy and mimics mini-bosses from Black Drake Villa.  Range taunt the adds but they won't be chained in.  Make sure to block heavy attacks and point boss away from group if you're the tank and it shouldn't be hard.
• Benefit: Purgator's Accession gives you a permanent buff going forward and will allow you to summon this mini-boss during upcoming fights.  Purgator's Accession "Weapon and Spell Damage increased by 300. Activating Purgator’s Guardian Stone summons Purgator for 1 minute and resurrects allies. With Purgator active: Light, Medium, Heavy and Bash attacks trigger Searing Sting which deals 50% additional fire damage and grants stacks of Heating Up."

Undertaker
Secret Entrance Map 1
Secret Entrance Map 2

• Health: 3,890,584
• Additional Enemies: Skeletal Archers
• Access: You'll need to access braziers and bring to the trap door shown in the picture below, along with simultaneously clicking the crystals also shown below.
• Mechanics: this mini boss is a Lich with very simple ground based AoE damage and Skeletal Archers.  Make sure to move out of the AoE ground damage and heal through any hard hitting abilites.
• Benefit: Undertaker’s Accession gives you a permanent buff going forward and will allow you to summon this mini-boss during upcoming fights. Undertaker’s Accession "Magicka and Stamina Recovery increased by 200. Activating Undertaker’s Guardian Stone summons Undertaker for 1 minute and resurrects allies. With Undertaker active: Light, Medium, Heavy and Bash attacks apply stacks of Siphon Essence which saps health from the target based on your max health."

Grim Warden
Secret Entrance Map 1
Secret Entrance Map 2

• Health: 4,238,933
• Additional Enemies: Twilights
• Access: You'll need to access braziers and bring to the trap door shown in the picture below, along with simultaneously clicking the crystals also shown below.
• Mechanics: this mini boss has some hard hitting additional enemies and a spinning mechanic that you need to prepare for.  Make sure that the tank blocks and moves out of the AoE, otherwise it could result in a wipe.
• Benefit: Grim Warden’s Accession gives you a permanent buff going forward and will allow you to summon this mini-boss during upcoming fights.  Grim Warden’s Accession "Light, Medium, Heavy and Bash attacks generate ultimate and apply stacks of Warding Aria which reduces damage taken."

Boss 1 Scorion Broodlord

• Main Boss #1
• Health: Veteran  2,525,979 and Hardmode 8,571,372
• Basics: this is the first boss and very hard for melee DPS. It also has hard hitting heavy attacks and damage over time attacks. It's highly recommended to bring some type of purge or cleanse for negative status effects if possible. Additionally, you can hit the pylon (crystal) in the corner of the room assuming you've completed the first secret boss.  This will resurrect fallen comrades and give you a boost in DPS.
• Additional Enemies: Every few percentage of health, the boss will continue to spawn additional enemies.  Up to four at a time which can be burned down on top of the boss or on top of the ranged enemy.
• Basic Mechanics
• Agonymium Stone: boss will shoot up into the sky, summon this at random throughout the area.  This is priority target as it will consume and heal the boss.
• Excruciating Expectoration: a hard hitting damage over time effect and will be a problem for the tank to deal with.  Prepare for this and reduce bosses damage and save an defensive ultimate if needed.
• Turmoil: AoE conal, make sure the tank points boss away and DPS/Healer are behind.
• Torrent of Turmoil: AoE circles that do decent damage which will go out in 360 degrees.  Do you best to avoid them.
• Crush: a hard hitting heavy attack that the tank should be the one to block and tank.
• Pull & Explode: If you leave the area where the boss is, this mechanic will suck everyone in and do damage.
• Hardmode Mechanics
• This gives the boss more HP and more frequent additional enemy spawns.  You can stack up the boss along with the adds on top of the Agonymium stone to make it easier, but be prepared for constant enemies and damage.
• Strategy: work on the bosses HP until adds spawn and quickly deal with them. Once the boss shoots up into the area, find the crystal and rotate to it. Tank should maintain aggro on all the mobs and stack on boss or ranged. Rinse and repeat.

Boss 2 Cyronin Artellian

• Main Boss #2
• Health: Veteran 2,873,301 and Hardmode 9,324,750
• Basics: this boss has a lot of mechanics some of which require mobility and can be very difficult if you are not able to dodge roll frequently.  Additionally, you can hit the pylon (crystal) in the corner of the room assuming you've completed the first and or the second secret boss.  This will resurrect fallen comrades and give you a boost in DPS.
• Basic Mechanics
• Storm Atronachs: these hard hitting, anti-melee mobs cause a ton of area damage and have a small window to bash and intreeupt.  You can destroy them but they will return so clump together on top of the boss whenever possible to kill multiple.
• Boltwyrm: these will tether to a specific player at random and need to be damage be whoever is tethered (even tank) as they will take more damage.  Destroy them quickly otherwise you'll most not likely survive.
• Staff Strike: simple heavy attack that leaves down a AoE damage effect.  Be careful where to park this.
• Soulstorm: this will be a one shot via a massive red skull from the center of the boss.  You must dodge this and I suggest going further back to help with detection.
• Dread Surge: red waves that flow throughout the room.  I would not suggest dodging them as sometimes you die and sometimes you do not.  Simply look for the NPC to put up a shield wall and park the boss on there.
• Hardmode Mechanics
• This gives the boss more HP and another mechanic which is a debuff that places a negative ground effect on you and will kill if you remain inside.
• Strategy: AoE down the adds with the boss in the center. Look for the NPC to put up a wall blocking waves. Destroy the Boltwyrm as they appear and move as a group. Dodge skulls to avoid death then drop ultimates and rinse and repeat.

Boss 3 Magma Incarnate 

• This is the third and final boss boss in Dread Cellar
• Health: Veteran  4,125,765 and Hardmode 15,567,056
• Basics: this boss is one of the most difficult in the game and a nightmare on Hardmode.  It's highly recommended to specialize in "tanky" sets, skills and playstyle until you learn the fight.  You will need mobility, survivability, and with 15 million HP, a lot of concentration
• Basic Mechanics
• Unstable Blitz: a hard hitting attack that should be avoided.
• Dancing Flames: simple AoE fire tornado that moves about.  Simply avoid it best you can.
• Catastrophe: targeting multiple players will shot out and hit you with a hard hitting DoT.  Try to dodge roll this after roughly 3 seconds though it'll take some practice.  Also don't stand onto of each other!
• Frenzy: simple heavy attack that needs to be blocked or dodge pending stamina.
• Portal: around 70%/35% health, the boss will become immune to damage and you'll need to run into the back of the room.  Here, you'll need to use a synergy in kill a crystal inside.  Otherwise it'll empower the boss and be very difficult to deal with.
• Path of Fire: hard mode will leave a pool of fire, because why not?
• Hardmode Mechanics
• This gives the boss a lot more HP and two mechanics.  One, outburst is a yellowish circle that the tank needs to stand in and block otherwise you will die.  Tornado wall which will swirl around the room and you can huge the center to avoid it.
• Strategy: work on boss during initial part of the battle avoiding the massive amount of fire and dealing with occasional adds. Go inside the portal at around 65% health and destroy the crystal dropping every ultimate and avoiding empowering the boss. Come out and more of the same, until the add spawns (spider) which needs to be taunted and dealt with immediately. Tanking during this time will be very difficult, but once down, rinse and repeat.