Ahead of the Curve: Argus the Unmaker

Tank

• Phase One: 100% - 70%
• Face Argus away from the raid at all times to avoid extra people from being hit by the Sweeping Scythe.
• Taunt off one another to allow the Sweeping Scythe debuff to drop, usually on 3 stacks.
• Place either of the Sky and Sea orbs either directly inside the bosses hitbox or 5 yards away from the boss.
• Maintaining either Strength of the Sky or Strength of the Sea is difficult for tanks. Do not focus too much on it.
• Phase Two: 70% - 40%
• Stand in the middle of the room at the beginning of the phase to avoid the Golganneth's Wrath storm.
• Drag Argus to one side of the room and keep him there throughout the phase.
• Face Argus away from the raid at all times to avoid extra people from being hit by the Sweeping Scythe.
• Taunt off one another to allow the Sweeping Scythe debuff to drop, usually on 3 stacks.
• Move over and stand next to the player afflicted with Soulbomb when you have the Avatar of Aggramar debuff.
• Avoid standing in any of the Edge of Obliteration scythe lines.
• Phase Three:
• Avoid standing in any of the Cosmic Ray beams.
• Have a tank each quickly pick up adds who gain weapons via The Stellar Armory.
• Tank the Sword of the Cosmos add 20 yards away from other adds to minimise the benefit they gain via the Cosmic Power cast.
• Tank the Blade of the Eternal add next to one of the other Constellar Designate adds to allow DPS to cleave them down.
• Interrupt the Cosmic Beacon cast of any nearby Constellar Designate adds.
• Phase Four: 40% - 0%
• When you die, Release Spirit and run over to the Gift of the Lifebinder Tree.
• Interrupt End of All Things.
• Drag Argus to one side of the room and keep him there throughout the phase.
• Face Argus away from the raid at all times to avoid extra people from being hit by the Deadly Scythe.
• Tank Argus until you eventually die from the Deadly Scythe. Then make sure to Release Spirit.
• Dodge Ember of Rage swirlies that fall from the sky throughout the phase.
• Help deal damage to any nearby Reorigination Modules.
• If you have time whilst in ghost form, collect any Mote of Titanic Power to eventually buff the raid with Titanforged.
• Avoid touching Hungering Soul adds whilst in ghost form. They knock you back and slow you if you touch them.
• Avoid standing within the Reorigination Pulse circles.

Healer

• Phase One: 100% - 70%
• Don't stand in front of the boss otherwise you may get hit by the Sweeping Scythe.
• Place either of the Sky and Sea orbs either directly inside the bosses hitbox or 5 yards away from the boss.
• Maintain either the Strength of the Sky or Strength of the Sea buffs by running into the same coloured orb each time they spawn.
• Use a healing cooldown when Tortured Rage overlaps with other sources of damage.
• Stack as a raid and move around as a unit each time Cone of Death is cast.
• Don't stand in the Death Fog.
• Move behind the group when afflicted with Soulblight to allow your debuff to expire in a safe location.
• Spot heal players afflicted with Soulblight.
• Phase Two: 70% - 40%
• Don't stand in front of the boss otherwise you may get hit by the Sweeping Scythe.
• Stand in the middle of the room at the beginning of the phase to avoid the Golganneth's Wrath storm.
• Stack up direcly under the boss to create distance for the Soulburst and Soulbomb players.
• Move 45+ yards away from the boss and other Soulburst/ Soulbomb players when afflicted with either Soulburst or Soulbomb.
• Spot heal players afflicted with Soulburst or Soulbomb to ensure that they do not die to the incoming detonations.
• Avoid standing in any of the Edge of Obliteration scythe lines.
• Phase Three:
• Avoid standing in any of the Cosmic Ray beams apart from your own if you are targeted.
• Interrupt the Cosmic Beacon cast of any nearby Constellar Designate adds.
• Use a healing cooldown to combat the damage of a Cosmic Smash if a Cosmic Beacon accidentally goes uninterrupted.
• Spot heal players who are randomly targeted by the Starblast.
• Phase Four: 40% - 0%
• When you die, Release Spirit and run over to the Gift of the Lifebinder Tree to resurrect.
• Interrupt End of All Things.
• Stack up direcly under the boss to create distance for the Soulburst and Soulbomb players.
• Move 45+ yards away from the boss and other Soulburst/ Soulbomb players when afflicted with either Soulburst or Soulbomb.
• Spot heal players afflicted with Soulburst or Soulbomb to ensure that they do not die to the incoming detonations.
• Dodge Ember of Rage swirlies that fall from the sky throughout the phase.
• Don't stand in front of the boss otherwise you may get hit by the Deadly Scythe.
• If you have time whilst in ghost form, collect any Mote of Titanic Power to eventually buff the raid with Titanforged.
• Avoid touching Hungering Soul adds whilst in ghost form. They knock you back and slow you if you touch them.
• Use a healing cooldown when Tortured Rage overlaps with other sources of raid wide damage.
• Avoid standing within the Reorigination Pulse circles.
• Heal up the Withered Gift of the Lifebinder tree as it gains stacks of Withering Roots to prolong its death, allowing for more players to use it to resurrect.

Damage

• Phase One: 100% - 70%
• Don't stand in front of the boss otherwise you may get hit by the Sweeping Scythe.
• Place either of the Sky and Sea orbs either directly inside the bosses hitbox or 5 yards away from the boss.
• Maintain either the Strength of the Sky or Strength of the Sea buffs by running into the same coloured orb each time they spawn.
• Stack as a raid and move around as a unit each time Cone of Death is cast.
• Don't stand in the Death Fog.
• Move behind the group when afflicted with Soulblight to allow your debuff to expire in a safe location.
• Phase Two: 70% - 40%
• Don't stand in front of the boss otherwise you may get hit by the Sweeping Scythe.
• Stand in the middle of the room at the beginning of the phase to avoid the Golganneth's Wrath storm.
• Stack up direcly under the boss to create distance for the Soulburst and Soulbomb players.
• Move 45+ yards away from the boss and other Soulburst/ Soulbomb players when afflicted with either Soulburst or Soulbomb.
• Avoid standing in any of the Edge of Obliteration scythe lines.
• Phase Three:
• Avoid standing in any of the Cosmic Ray beams apart from your own if you are targeted.
• Interrupt the Cosmic Beacon cast of any nearby Constellar Designate adds.
• Identify and attack the add that is taking increased damage from your school of magic via The Discs of Norgannon.
• Kill off the adds as soon as possible.
• Phase Four: 40% - 0%
• When you die, Release Spirit and run over to the Gift of the Lifebinder Tree to resurrect.
• Interrupt End of All Things.
• Stack up direcly under the boss to create distance for the Soulburst and Soulbomb players.
• Move 45+ yards away from the boss and other Soulburst/ Soulbomb players when afflicted with either Soulburst or Soulbomb.
• Dodge Ember of Rage swirlies that fall from the sky throughout the phase.
• Don't stand in front of the boss otherwise you may get hit by the Deadly Scythe.
• If you have time whilst in ghost form, collect any Mote of Titanic Power to eventually buff the raid with Titanforged.
• Avoid touching Hungering Soul adds whilst in ghost form. They knock you back and slow you if you touch them.
• Focus down any Reorigination Modules as soon as possible to ensure their Reorigination Pulse circle is as small as possible.
• Avoid standing within the Reorigination Pulse circles.

Source: Argus the Unmaker Antorus Raid Strategy Guide - Guides - Wowhead