Just go on Crasus' Landing(opposite side of doors) and type #halion, every NPC there will be despawned for 10 min and Halion will appear...
Halion have 80 stacks of Attuned to Nature (Increases healing received by 8% for each stack) and Touch of Eonar (Healing 24000 every sec)
Eadric is spawning "Debuff Brazier", if you click on it you will heal him for 5% and dispel 5stacks of Attuned to Nature on Halion, he will summon one brazier every 10 sec for 5 sec, 19 braziers total in first phase
if halion will get eadric to 50% eadric begins to cast divine shield and heal self, then you will get 3 more braziers every 20 sec
if eadric and players will get halion to 30% and eadric has already used divine shield he will get enrage, increasing his HP by 1.5M, regenerating 30% hp every few secs and increases damage by 15%
If you have turned ON this battle you will receive a lot of broadcast messages, so you can see what are both doing, how much stacks Halion have etc... every player will receive 5x emblem of frost after defeating Halion(they must be close to Eadric)
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