The correct way to fight this battle is to watch out for and move accordingly to the following abilities:
Void Bolt: Soulflayer Yor'sahj blasts his primary target with dark energy, dealing 75000 Shadow damage and reducing the amount of healing they take by -5%.
Call Blood of the Old Gods: Soulflayer Yor'sahj calls to the might of the Old Gods, summoning a globule of their blood. These globules will path slowly towards Yor'sahj, infusing him with their powers if they reach him.
Fusing Vapors: When attacked, the blood globules emit a vapor that fuses with all other nearby globules, healing them for 5% of their maximum life
Glowing Blood of the Old Gods: Yor'sahj becomes Infused with the Glowing Blood of the Old Gods, causing Void Bolt to hit all nearby targets, reducing the cooldowns by half, and increasing attack speed by 50%.
Cobalt Blood of the Old Gods: Grants the ability: Mana Void. Mana voids will leech the mana from all casters and healers, storing it in the void. Destroying the mana void will return the sum of the mana leeched evenly to all units within 18 yards.
Crimson Blood of the Old Gods: Grants the ability: Searing Blood. Yor'sahj sears the blood of random enemies, dealing 25000 base Fire damage. The further the target stands from Yor'sahj, the more shock they receive from the blast.
Black Blood of the Old Gods: Causes the mouth of Iso'rath to become a bubbling cesspool of corruption, spawning Forgotten Ones periodically.
Forgotten One: Ads that fixate on a random target.
Psychic Slice: Channels a wave of psychic force in a cone in front of the caster, dealing 160000 Shadow damage.
Acidic Blood of the Old Gods: Causes the mouth of Iso'rath to bubble with Digestive Juices. Digestive acid periodically leaks from the stomach lining, dealing 35000 Nature damage to an enemy and its surrounding allies within 4 yards.
Shadowed Blood of the Old Gods: Grants the ability: Deep Corruption. Healing or absorbtion effects taken while under this effect will trigger a detonation at 5 stacks, dealing 50000 Shadow damage to all nearby allies.
