The Eye of the Jailer
When Azeroth was young, Odyn traded his eye to Mueh'zala to peer into the Shadowlands. Vain Odyn was deceived, for the Jailer twisted the Eye to serve his own ends. The Eye's unwavering gaze allows the Jailer to see all that transpires within his domain--and perhaps others as well.
This is a two-phase encounter with multiple intermission phases. You will fight against the Eye of the Jailer 3 times for 33% boss health per time. The final 33% of the fight will be a race against time as you will receive less and less healing to the point where you become unhealable from Immediate Extermination.
Throughout the fight, you will need to make good use of the space in the room. Whilst it is a large room, you will need to be mindful of not wasting good space in the room as puddles that spawn during the intermission are permanent, and you will need access to the Harpoons at either end to jump across the gap to avoid Annihilating Glare.
Phase 1 (Eye of the Jailer)
Piercing Lens - This is the replacement for the melee swing on this encounter. As the boss is an eye, it will aggressively look at you instead of hitting you.
Deathlink - This is the tankbuster of the encounter, and you will need to mitigate this as best you can. Damage that you take will be dealt to the raid.
You can dodge/parry this, which means 0 damage taken by the raid.
Fracture Soul - White zones will appear on the floor. Move out of these. If this hits you, you will be affected by Fractured Soul, which splits your Soul into 3, and you need to collect them by running into it. Whilst you have the Fractured Soul debuff, your damage/healing will be lowered by 30%, and you will be slowed by 20%.
Annihilating Glare - The boss will pick a position in the room and project a beam that will sweep across the entire room. You will need to avoid being hit by this beam as it will deal a large amount of Shadow damage to you, and if you survive, you will be knocked back. You can jump over the gap at the back of the room with the chains located at the end of the platform.
On PTR, we noted that the boss would face one side, and it would always sweep across the platform first. For example, if the boss faced the left, the beam would sweep to the right and vice versa.
Eye Bolt - During this phase, they will cast this spell on random players dealing a small burst of Shadow damage.
[Heroic] Stygian Abductors
Dragging Chains - The Abductor will target a player that it will throw chains on. This player will have a glowing area around them. Any players inside this area will be chained to the Abductor, and it will attempt to pull you off the platform. However, you can pull against the chain and pull the Abductor onto the platform!
Assailing Lance - Once the Abductor is on the platform, it will need to be tanked, and it will periodically apply a stacking bleed to the tank. You should tank this next to the boss and swap on 2 stacks of the bleed.
Intermissions (Deathseeker Eyes)
This phase begins once the boss has reached 66% or 33% health.
At the start of this phase, the boss will retreat, and two of the Deathseeker Eyes surrounding it will come down on either side of the platform. They must not be within 55 yards of each other as they will trigger Shared Suffering.
During this phase, the boss will continue to use Fracture Soul and will gain two new abilities:
Titanic Death Gaze - This is a large raid-wide AoE which is unavoidable. You have to heal through it and potentially assign cooldowns for it.
Desolation Beam - One non-tank player will be targeted with this and have a visible animation around them. After 6 seconds, the beam will be cast on that player. If any players are nearby, it will chain to them, dealing more damage (and if players are near that player, it will continue chaining and dealing more damage!)
Piercing Lens - Similar to the boss in phase 1, this will be the equivalent of a melee swing on the tank.
Spreading Misery - Will be cast on players throughout the phase, and after 5 seconds, a Jailer's Misery puddle will be left on the ground. These puddles do not despawn and should be placed towards the edge of the room to maximise available space (you have 3 intermission phases, so many puddles will spawn!)
Slothful Corruption - This debuff will be applied to several players periodically. It will slow spell casting and ranged attack speed (as well as movement speed). Ranged DPS should be dispelled as a priority.
After two eyes have been defeated, the Eye of the Jailer will return going into Phase 1. If you have defeated all 4 Deathseeker Eyes, Phase 2 will begin.
Phase 2 (Execute)
The final 33%! This Phase will play similarly to Phase 1; however, during this phase, the boss will buff themselves with Immediate Extermination.
Immediate Extermination - In addition to the boss increasing their attack rate by 50%, every 6 seconds, a burst of unavoidable Shadow damage will be dealt to the raid and apply a stacking debuff reducing healing received by 10% per stack.
In addition to the new buff, the boss has gained it will also cast Desolation Beam from the Intermission.
Eye Bolt will no longer be cast as....there are no Deathseeker Eyes to cast it.
Tank Damage Profile
Eye of the Jailer / Deathseeker Eyes: Inconsistent "Swing" timers. Lowest observed was 2s.
Stygian Abductor Swing Timer: 2s (Curse of Weakness 2.4s)
Vengeance Demon Hunter
Blood Death Knight