Let’s get right into, Ko’ragh has a shield which absorbs 5 million magic damage. While the shield is up his damage will increase by 6% every 10 seconds and once it breaks the bonus damage is removed. Because of this you will want to have plenty of casters in your team. Once it reaches 0 Ko’ragh will have to recharge it in 20 seconds. After which the shield is restored.
While Ko’ragh is recharging you can have one player stand on the rune in the middle. This will give them Caustic Energy. While standing on the rune it will deal damage every second and reduces their healing received by 35%. Once the rune powers down you yourself will get a magic absorbtion shield. The amount of damage the shield can take becomes higher the longer you stand in the rune while Ko’ragh is recharging. You will want a ranged dps to stand in the rune for the full duration each time.
You will need this shield because of Overflowing Energy. Orbs will drop from the sky and if they touch someone they will explode and deal over a million damage to them. You will want to have players with the magic absobtion shield standing underneath it because if it reaches the ground instead it will deal a lot of aoe damage to the entire raid instead. More orbs will spawn as the encounter progresses, so the higher you can get your shield when standing in the rune, the more players you will have to intercept the orbs.
While the shield and orbs are the main difficulty of the fight there are other things to watch out for.
First off there’s the Suppression Field which is an area effect that deals adamage and silences players in it. However this also silences the adds that will spawn during the encounter. When Ko’ragh is recharging and the rune is up 3 Volatile Anomalies will spawn every 8 seconds and will have to be killed. When these die they will deal 43k damage to everyone in the raid, unless they explode in a Suppression Field. So this of course means your tank will have to get the Volatile Anomalies to a suppresion field before they die.
Ko’ragh can also expel 4 different types of magic with each having different effects.
When he expels fire he will deal damage to the entire raid every second for 10 seconds. When it ends it will deal a high amount of damage to everyone in the raid and extra damage to those standing within 5 yards of each other. So stay spread.
When he expels arcane he will debuff a player. Every half a second it will create a rune on the floor and after 1,5 second it will explode dealing just about lethal damage to anyone withing 5 yards of the rune. So if you get the debuff, move it away from the group and everyone else will want to move away from the runes themselves.
When he expels frost he will summon a frost orb that deals roughly 100k damage to the entire raid and slow them the closer they are to the orb. This will dissapear after 20 seconds.
And finally if he expels shadow every player will get a debuff which absorbs 140k healing on them. This will have to be healed off players or risk getting them killed from other spells.
This is definitely ones of those fights where there are a lot of different effects to watch out for. Just keep the main mechanic in mind which is the magic shield and the orbs that will drop to the floor. Besides that, kill the adds as they spawn, preferably when they are in the suppression field, when you get the fire stay spread atleast 5 yards, if you get the arcane move it away from the rest, heal through the shadow debuff and stay away from the frost orb.
The easiest positioning we found was to have the boss tanked in the middle. The one issue we had was that sometimes melee would not get out of the middle quickly enough before Ko’ragh started recharging, meaning the assigned ranged dps to get the shield could not absorb the rune anymore. So have your melee get out of the middle before his shield is completely depleted.
The expel arcane also seemed to only go on the tank, so we had a trail of markers for the tank to run out via them. Noone was allowed to stay on those markers so that the expel arcane could be dealt with safely.
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