Sennarth
Sennarth

Raid Boss

Sennarth

Sennarth, Kurog Grimtotem's most fearsome creation, is a giant spider imbued with merciless cold. Their sole raison d'être is to guard their brood of thousands, waiting for the day when they hatch and blanket Azeroth in a web of winter.

DPS
Enveloping Webs limit your stacks.
Caustic Eruption manage your web debuff.
Gossamer Burst don't get pulled off.
Chilling Aura kill the adds.
Web Blast tank swap.
Chilling Blast spread and avoid plumes.
Suffocating Webs position yourself for knocks.
Repelling Burst stand in webs.
Caustic Eruption manage your web debuff.
Icy Ground don't slide off or into plumes.
Permafrost stay on the top platform.
Pervasive Cold kill the boss.
Heroic Changes
Instead of being snared, players can now fall off and die if they are pulled or pushed all the way to the edge of the platform.
Reaching 10 stacks of the web debuff will stun you for 30s instead of snaring you, which is way more dangerous.
In P2, players targeted by Suffocating Webs now get cocooned and cannot move until freed, making this ability much more dangerous.
Mythic Changes
In P1, the ramps between each platform are covered in ice and filled with moving tornadoes. Climbing to the next platform becomes very dangerous.
The tiny spiders' explosions that reset your snare stacks now also apply a 30s 300% vulnerability to future explosions. Do not take another explosion while vulnerable!

Icy Ground

https://www.wowhead.com/en/spell=372055 - The floor is slippery. Don't slide off or into plumes!
don't slide off or into plumes

Pervasive Cold

https://www.wowhead.com/en/spell=372648 - Soft enrage mechanism. The boss gains a stacking 10% damage increase over time.
kill the boss

Permafrost

https://www.wowhead.com/en/spell=372736 - Lower platform levels will deal increasing ticking damage to those on them.
stay on the top platform

Chilling Aura

https://www.wowhead.com/en/spell=373817 - Big spiders keep buffing themselves and deal ramping raid damage, making them a priority target.
kill the adds

Web Blast

https://www.wowhead.com/en/spell=385083 - Boss' auto-attacks on the tank in P1 apply a stacking vulnerability that lasts 20s. Tanks need to switch every 5 stacks or when their debuff falls off.
tank swap

Chilling Blast

https://www.wowhead.com/en/spell=371976 - All players are debuffed with a circle that will explode after 5s.Leaves behind plumes that will knock back and damage anyone who touches them.
spread. avoid touching plumes on the ground.

Repelling Burst

https://www.wowhead.com/en/spell=371983 - The boss deals damage and knocks everyone back. Standing in webs will negate the knockback.Don't get knocked into plumes or to the edges of the platform.
stand in webs so you aren't knocked far or outside the platform.

Caustic Eruption

https://www.wowhead.com/en/spell=372045 - Spiderlings explode when they die, dealing damage 5yds around them.This explosion removes all slow effects from webs.
use spider explosions to remove web effects.

Enveloping Webs

https://www.wowhead.com/en/spell=372082 - Several players are debuffed and drop webs at their feet for 6s. Standing in webs applies a 25% slow. Reaching 10 stacks slows you by 75% for 30s.
move out of webs and limit your stacks to the minimum.

Breath of Ice

https://www.wowhead.com/en/spell=372765 - Swirls mark areas where ice will land. They leave behind ice patches which deal ticking damage and make your character slide around slightly.
dodge the swirls. ice on the ground is slidy.

Suffocating Webs

https://www.wowhead.com/en/spell=373027 - Several players are debuffed with a 6s DoT and drop webs, then knocked back and slowed by 75% for 30s.Try to avoid being knocked into plumes or off the edge!
position yourself before entanglement to not get knocked into plumes or off the edge.

Gossamer Burst

https://www.wowhead.com/en/spell=373405 - The boss pulls everyone inward. Slows from webs reduce the pull, and standing in the webs will fully negate it. Players who are pulled all the way in are slowed by 75% for 30s.
move far away or stand in webs to not get pulled off.

Freezing Breath

https://www.wowhead.com/en/spell=374112 - Frontal cone on the tank that deals a lot of damage. Also leaves behind ice patches.
don't stand in front of the spider.

Gusting Rime

https://www.wowhead.com/en/spell=396792 - The ramps between each platform are covered in ice and filled with moving tornadoes. They deal damage and knock back players. Moving to the next platform becomes very dangerous.Sennarth also spawns 2/3 tornadoes on each platform, but they're not very dangerous.
dodge the tornadoes while climbing to the next platform.

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