Ahead of the Curve: Argus the Unmaker

Tank

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.

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.

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.

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

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.

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.

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.

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

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.

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.

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.

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.