Sennarth Raid Guide: Vault of the Incarnates

Key Takeaways

• Sennarth, the Cold Breath is the fourth of eight bosses in Vault of the Incarnates, the Dragonflight Season 1 raid added with Patch 10.0.2.
• The encounter runs in two phases: Phase 1 chases Sennarth up the platforms of an icy spire, and Phase 2 starts once she reaches the summit.
• Web Blast stacks a tank debuff, so swap tanks around 8 stacks or as it falls off.
• Web mechanics build stacks toward a snare, and on Heroic a 10-stack Wrapped in Webs becomes a 30-second stun.
• Caustic Spiderlings explode into Caustic Eruption, which clears web debuffs, so kill them on top of webbed players.
• Knockbacks like Gossamer Burst and Repelling Burst push you toward the ledge, so a web stack's slow is useful traction.
• Mythic adds Gusting Rime tornadoes in Phase 1 and a 300% vulnerability to repeated Caustic Eruptions.

With those headlines in mind, here is how the fight unfolds from the opening pull through the Mythic-only additions.

Sennarth Encounter Overview

Sennarth, the Cold Breath is a giant ice spider and the fourth boss of Vault of the Incarnates, the raid that opened Dragonflight Season 1 in December 2022. The pull order before her runs Eranog, Terros, the Primal Council, then Sennarth, with Dathea, Kurog Grimtotem, Broodkeeper Diurna, and Raszageth still to come. The fight is a two-phase climb: in Phase 1 you chase her up the levels of a spire, and Phase 2 begins when she settles at the top. The same script carries through Normal, Heroic, and Mythic, with each difficulty layering on extra danger rather than rewriting the fight.

Sennarth Normal Difficulty

Phase 1 is all about following Sennarth upward while handling her web kit. Web Blast stacks a debuff on her tank, so swap every eight or so stacks or when the debuff falls off.

There is one big Frostbreath Arachnid add on each level. Dodge its cone breath and kill it before its Chilling Aura stacks out of control.

That add and the boss both leave Icy Ground puddles. The ice only chips at your health, but it is slippery, so step around it when you can.

Enveloping Webs marks a couple of players to drop webs under their feet for six seconds. Standing in webs stacks a debuff, and 10 stacks puts you in trouble, so run the webs out to the side.

Caustic Spiderlings are tiny adds, and when they die they leave a small Caustic Eruption. That blast clears webs on the ground and strips web debuffs from anyone it hits. Kill them on top of webs to open up space, and dip into the death pops if you are carrying a lot of web stacks.

You may want some of those webs, though, because Gossamer Burst tries to slide you off the edge. Run against the pull, and if you are in danger of going over, touch a web to pick up a stack of the slow. You might not need it, but it gives you traction in a pinch.

Chilling Blast is a simple spread mechanic. Spread out when you get the ice circles.

Dodge swirls and follow the boss up the levels as she leaves. When she hits the top, Phase 2 begins.

Interrupt her Apex of Ice and do not get left behind, because the lower levels get toasted by Permafrost.

The Chilling Blast ice-circle spread continues, but this time it leaves behind a Glacial Plume to avoid. Spread out and watch where you are going.

Webs change in Phase 2. Suffocating Webs hurts a few players for six seconds, then knocks them back and gives them maximum web stacks. The baby spiders keep spawning, so keep killing them on top of webbed players to clear the debuff. If you pick up webs in this phase, keep your back away from the cliff.

Speaking of the cliff, Repelling Burst pushes players away from the boss. Watch where you stand so you do not get knocked off. You also take increasing frost damage for the rest of the fight, so pop your remaining cooldowns and finish her. On Normal, that is the whole fight.

The video below walks through the same Phase 1 and Phase 2 sequence if you would rather see the timings in motion.

With the core script in muscle memory, the difficulty jumps below only add a few new wrinkles to track.

Sennarth Heroic Difficulty

On Heroic, the 10-stack web debuff Wrapped in Webs upgrades the snare into a 30-second stun. You run the fight the same way, but a sloppy web pickup now removes a player from the pull entirely, so the spiderling-on-webs cleanup matters far more.

Sennarth Mythic Difficulty

Mythic introduces Gusting Rime in Phase 1. Sennarth summons moving tornadoes across the platforms, and players caught by one take damage and get knocked back, which is lethal near a ledge.

Caustic Eruption also gets nastier. The tiny spiders' explosions that reset your snare stacks now apply a 300% vulnerability for 30 seconds to any future explosion. Do not take a second eruption while that vulnerability is up, or it will delete you.

Frequently Asked Questions

Which raid and patch is Sennarth from?

Sennarth, the Cold Breath is the fourth boss of Vault of the Incarnates, the eight-boss raid that launched Dragonflight Season 1 with Patch 10.0.2 in late 2022. The wing also holds Eranog, Terros, the Primal Council, Dathea, Kurog Grimtotem, Broodkeeper Diurna, and the final boss Raszageth.

How many phases does the Sennarth fight have?

Two. Phase 1 chases Sennarth up the platforms of the spire while you manage adds, webs, and knockbacks. Phase 2 starts when she reaches the summit, swapping in Suffocating Webs, Glacial Plume, and constant frost damage as a soft enrage.

How do I handle web stacks on Sennarth?

Standing in Enveloping Webs builds a debuff that snares you and, at 10 stacks on Heroic, becomes the Wrapped in Webs stun. Caustic Spiderlings clear web debuffs when they explode, so kill them on top of webbed players, and run fresh webs out to the edges of the platform.

Why do players keep dying off the edge?

Gossamer Burst in Phase 1 and Repelling Burst in Phase 2 are knockbacks that shove players toward the ledge. Position with the cliff behind the boss rather than behind you, and carry a web stack for the extra traction when a burst is about to land.

What changes on Mythic Sennarth?

Mythic adds Gusting Rime tornadoes in Phase 1 and stacks a 300% vulnerability onto repeated Caustic Eruptions. The tornadoes punish anyone hugging the edge, and the vulnerability means you cannot eat two spiderling explosions in quick succession.

Can I still run Vault of the Incarnates today?

Yes. As a legacy Dragonflight raid, Vault of the Incarnates is open for backtracking on every difficulty, which makes it a popular target for transmog, the Cutting Edge feat, and mount hunters chasing earlier-expansion rewards.

That covers Sennarth on Normal, Heroic, and Mythic. If you would rather skip the wipes and lock the kill, you can book a WoW raid carry run with our team. Last reviewed 2026-06-27 against Patch 10.0.2 Vault of the Incarnates. Maintained by WowCarry's WoW team.