Obsessively wielding the power that N'Zoth has granted her, Nexiona has amassed a cult of worshippers who covet the gifts of the Void. From high atop her temple, within the Black Empire, she transforms her most devout followers into unstoppable horrors.
Twilight Breath - This is a typical dragon breath which will attack all players in a cone in front of the boss. The breath will deal moderate amounts of Shadow damage every 0.4 seconds for 1.6 seconds. Each tick will also apply a stack of Void Corruption.
Despair - Vexiona will apply this debuff on her target which will deal moderate amounts of Shadow damage every second for 6 seconds. When this debuff expires it will deal a small amount of Shadow damage and an additional amount based on your missing health to the entire raid, this damage is called Shattered Resolve.
Encroaching Shadows - This will apply debuffs on random non-tank players and deal moderate Shadow damage to that target and all players within 9 yards. After 8 seconds the debuff will expire and leave a pool of Shadowy Residue on the floor.
The Shadowy Residue will persist for the entire encounter, so it is vital that you place them away from locations the raid plans to use. If you have a personal you are able to stack these on top of each other.
Annihilation - This is the iconic ability of this enemy and will channel a beam towards its target. This beam will deal Shadow damage to players and Cultists every 0.25 seconds for 5 seconds. Each hit will apply a debuff which will increase damage taken from Annihilation by 25% for 6 seconds which can stack up to 20 times.
Dark Gateway - This will deal moderate amounts of Shadow damage to the entire raid and spawn a portal in the room. Cultists will spawn through this portal.
Fanatical Cultists will melee for a low amount of Physical damage, however when they reach 100 energy they will cast Fanatical Ascension. If this cast completes they will transform into a Void Ascendant.
Phase 2 will begin when Vexiona reaches 100 energy.
Phase 2 (Airborne)
Vexiona will fly into the air and no longer be able to summon any adds during this phase.
Twilight Decimator - Vexiona will strike one third of the room with fire, therefore the room will be divided into 3 sections as shown in the map below (the naming convention shown is what I personally used during testing).
She will not strike the same area twice, and she will alternate which side she attacks from. It's best to have someone in the raid be vigilant and call out which section is going to be hit.
Note: From my observations during testing she will never go into the same area twice in a row, so it is safe to enter the previously attacked area once it has cleared (which will be just as the next attack begins).
Heart of Darkness - Vexiona will channel energy around her, when the cast completes the raid will take a large amount of Shadow damage, however can be reduced based on your distance from Vexiona. If you have the Terrifying Presence debuff you will be feared for 8 seconds and gain an additional Void Corruption stack.
[Heroic] Desolation - The target of this will be slowed by 50%, have a ring placed around them and will take a large amount of Shadow damage which will also apply 30 stacks of Void Corruption. However, the damage and the Void Corruption stacks are split with all nearby players. You cannot solo Desolation, if it fails to hit at least 3 players it will trigger Destructive Rage.