Emeriss Emeriss is one of the four Dragons of Nightmare . In recent times , Ysera ' s most trusted lieutenants have been warped by a dark new power within the Emerald Dream . Now these wayward sentinels have passed through the Great Tree s into Azeroth , intending to spread madness and terror throughout the mortal kingdoms . The mysterious dark power within the Emerald Dream has transformed the once - majestic Emeriss into a rotting , diseased monstrosity . Reports from the few who have survived encounters with the dragon have told horrifying tales of putrid mushrooms erupting from the corpses of their dead companions . Emeriss is truly the most gruesome and appalling of Ysera ' s estranged green dragons . Stormrage . In the novel Stormrage , Emeriss is one of the major antagonists as a servant of the Nightmare . She is eventually killed by Tyrande Whisperwind . Seeking to destroy the only weapon that can hurt him , the Nightmare Lord seizes the Axe of Broxigar from its owner Thura , but attempts to trick Malfurion Stormrage into destroying it as no minion of the Nightmare can touch it . Capturing Tyrande in order to lure Malfurion to the axe ' s location , the Nightmare also guides him with the corrupted Remulos . When they arrive and seemingly chases away Emeriss who is guarding the axe , Remulos tries to coerce Malfurion into draining the axe ' s energies in order to cleanse it , even if it is destroyed in the process . More concerned about Tyrande , Malfurion decides to free her first . Angered with his choice , the Nightmare Lord chooses to battle Malfurion through the corrupted Remulos . As Remulos is defeated , Emeriss returns to continue the battle , but Tyrande regains consciousness and attempts to remove Emeriss ' corruption with the power of Elune . It fails though , since Emeriss is nothing left but corruption . As the cleansing removes the taint of the Nightmare , it also disintegrates the entire dragon . Tyrande states , " " . . . There was nothing left " but " the corruption . . . and when I tried to heal that . . . it left only emptiness . . . " " Overview . Emeriss is one of the Emerald Dragons . The other Emerald Dragons are Lethon , Ysondre , and Taerar . These dragons are world spawns located in Duskwood ( Twilight Grove ) , the Hinterlands ( Seradane ) , Feralas ( Dream Bough ) , and Ashenvale ( Bough Shadow ) . They are raid - level difficulty . However , some dragons are more challenging than others . Emeriss is considered to be the second hardest . However , this is debatable as the difficulty of Lethon largely depends on the quality and experience of one raid - member . Emeriss , by comparison , requires the attention and focus of all your raid - members . The dragon is very easy if everyone does his job well but she will make quick work of your raid if mistakes happen . All four dragons share the Sleep ( summoning " Dream Fog " ) , Noxious Breath , Tail Sweep , Mark of Nature and Aura of Nature abilities . Each dragon also has a few unique abilities . One of these is considered the dragon ' s ace move , and will be performed when the dragon loses 25 ± 5 % of its max life . In other words , the ace move will only be performed three times ; when the dragon is at 25 % , 50 % , and 75 % life . When it is performed , the dragon will also yell something . Notes . Currently , Emeriss casts Corruption of Earth randomly at + / - 10 % of 75 % , 50 % , and 25 % . That means that at 85 % , 60 % , and 35 % , the ranged and melee DPS need to run out . Your raid needs Healer groups to stay in at 85 , 60 , and 35 % . Have a priest in each of the healer groups and your top dps in groups with priests in them . At the mentioned percentages , have everyone but the people in groups with priests in them run out . When corruption is cast , have the priests spam prayer of healing on their groups . Make sure that the people in the groups stay close enough to the priest , but spread out just enough to avoid getting the priest chain slept . Smart priests that know how to avoid the sleep clouds are key to this strategy . Nature resists apparently also help resist the sleep clouds . This is also a world boss , keep in mind that her difficulty will change , pending on the levels of the raid , thus again , making her a lot more difficult then she seems . Trivia . When the dragons were released to the game , it was possible to counter Emeriss ' Corruption of the Earth - spell with the device . This would cause the spell to be reflected , forcing Emeriss to kill herself within few seconds . The glitch was rapidly patched the week after when Blizzard had become aware of it .