Sennarth, the Cold Breath
Sennarth, Kurog Grimtotem's most vicious creation, is a massive arachnid infused with the unforgiving cold. Her singular purpose is to guard her brood of thousands, awaiting the day they'll hatch and enshroud Azeroth in a web of winter.
This page is purely speculative based on the Dungeon Journal. It will be updated as tests go on.
Sennarth is a multi-phase encounter.
You will first fight her on the floor of her chamber and as you fight her she will climb a staircase with multiple platforms.
On each Platform Sennarth will summon Frostbreath Arachnids to help her.
Based on how the room is laid out I feel the fight will play out as shown below. There are 4 platforms so Sennarth likely ascends every 25% and spawns an additional Frostbreath Arachnid on each platform and spawns none on the final platform.
Fight her to the top of the staircase to reach the final phase and defear her.
Chilling Blast - Several players will be targeted by this mechanic. They will take a small amount of Frost damage over 4 seconds.
When this effect expires or is removed Frost Expulsion will trigger.
Frost Expulsion deals a high amount of Frost damage to all other players within 4 yards. Move away before it expires.
The Dungeon Journal explictly states that Frost Expulsion is caused on expiration or removal indicating that it could be dispelled.
- These spawn throughout the encounter.
- When they die they will cast Caustic Eruption.
- Caustic Eruption
- All players within 5 yards are hit.
- This removes any stacks of Sticky Webbing.
- This destroys Wrapped in Webs.
- Mythic Only Taking damage from Caustic Eruption leaves a 30 second debuff which increases damage taken from it by 300%. This effect stacks.
Enveloping Webs - Several players will be targeted by this mechanic. They will take a moderate amount of Physical damage over 6 seconds and then drop Sticky Webbing.
Gossamer Burst - All players will be pulled towards the boss and take a large amount of Physical damage.
Web Blast - This is a stacking debuff from special attacks from Sennarth. Each time you are hit by it you will take 50% more damage from Web Blasts for 30 seconds. 5-8 stack swap. Taunt when your debuff runs out.
- Frontal Cone which creates patches of Icy Ground.
- Chilling Aura
- Deals moderate raid wide damage.
- Applies a buff on itself increasing Frost damage done by 25% per stack.
Based on how the encounter arena is set up I suspect that the first platform will have one Frostbreath Arachnid and the second will have two.
The Frozen Precipice
Apex of Ice - When Sennarth reaches the top of the staircase she will channel this spell. Whilst this is being channeled Sennarth will take 99% less damage and deal increasing damage to the raid.
This also creates Icy Ground on the final platform.
The raid should ideally bait this first cast so that the players targeted do not get knocked off and then for all subsequent casts you can obtain Sticky Webbing to prevent the knockback.
Pervasive Cold - This buff is applied to the boss this phase which causes the raid to take 10% more Frost damage per tick until she dies.
Tank Damage Profile
Unkown until testing, speculated numbers above.
Tank Class Tips/Tricks
Vengeance Demon Hunter
Blood Death Knight