The Emerald Nightmare

Nythendra's [Infested Breath] unleashes great gouts of insects and corruption, consuming 50 Energy. When Nythendra's Energy is depleted, she collapses to the ground and [Heart of the Swarm] begins. Once she is fully recharged, her form coalesces and she resumes her attack.

Players begin the encounter fighting against Il'gynoth's erupting eyestalks and tentacles, while the monstrous Eye bars the way to the heart of the tree. Defeating these tentacles spawns animated Nightmare Ichor globules, which players can destroy near the Eye to damage it. Once the Eye is defeated, players can enter the hollow to damage Il'gynoth directly for a time, after which the Eye reforms

Players engage creatures of nightmare while the Eye of Il'gynoth watches over them, directing the forces of corruption.

When the Eye of Il'gynoth is destroyed, the chamber holding Il'gynoth's beating heart is revealed.

As the fight progresses, Elerethe swaps between the nightmarish forms of a spider and a roc. When she takes to the skies as a roc, she moves to a different platform, forcing players to weather her [Dark Storm] as they make their way towards her.

Takes the form of a nightmare spider.

Running into these egg sacs releases a swarm of Skittering Spiderlings.

Venomous Spiderlings appear from the web during the encounter.

Ursoc tramples his enemies with [Barreling Impact] and periodically roars for a [Roaring Cacophany].

Ysondre shares health with Emeriss, Lethon, and Taerar. She begins the fight alongside the nightmare of one of her former cohorts. When Ysondre reaches 70% health remaining, the nightmare takes to the skies and a new one emerges from a nearby portal. Upon reaching 40% health remaining, the nightmare dragon in the air lands and the one on the ground takes to the air.

Ysondre and the nightmare of each of her cohorts share the following abilities on the ground.

Ysondre shares health with Emeriss, Lethon, and Taerar.

The fallen Cenarius periodically creates Nightmare Seeds, which germinate for a short duration and then summon an Ally of Nightmare that must be defeated. Malfurion aids in the battle and cleanses the Nightmare Seed with the largest number of nearby players, purifying that Ally so that it instead helps the raid.

Forces of Nightmare will spawn after a short duration if not Cleansed. Players can signal Malfurion to Cleanse the ground near an Ally of Nightmare by being near the location that it is being summoned at. Malfurion will choose to cast [Cleansing Ground] on the Ally of Nightmare with the most players near it.

After the last wave of Forces of Nightmare are defeated or when Cenarius reaches 35% health Stage Two will begin.

Most of Nightmare Lord Xavius's attacks inflict Corruption on their victims. As a player gains more Corruption, they become increasingly vulnerable to the power of the Nightmare, eventually losing control entirely and turning against their friends at maximum Corruption. Players' only hope lies in the power of Ysera, who puts many of them into a deep slumber and forms a [Dream Simulacrum] of thos

When Xavius reaches 95% and 60% health, the Dream of Ysera puts half of the party into a Dreaming State. Affected players fall asleep while a Dream Simulacrum of them rises to fight Xavius. If the Dream Simulacrum should ever die, the player's actual body will awaken. All Nightmare Corruption gained by the Dream Simulacrum is lost when the player returns to their body.

Many of Xavius's spells spread Nightmare Corruption to those hit. The more corrupted a player becomes, the more the nightmare becomes real to the player. Should any player ever become completely corrupted, they will become dominated by Xavius.

Upon reaching 65% health remaining, Xavius intensifies his attack.

Upon reaching 30% health remaining, Xavius calls upon the purest Nightmare to engulf his enemies.