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“With the cult’s ranks thinned and some of their power stripped, it’s time to strike at the source of the corruption. Rothin the Decaying is resurrecting black dragons as magmawyrms in the back of the cave. Go to the summoning chamber and cleanse the remaining bones in the only way that will ensure that they will never be toyed with again… with flame.
Burning the bones will surely gain Rothin’s attention, see to it that he is destroyed as well.”
-Serinar
Use Neltharion’s Flame to douse the summoning area in the back of the Maw of Neltharion. Once you get the attention of Rothin the Decaying, kill him, then return to Serinar at the front of the cave.
Provided item:

Upon completion of this quest you will gain:
Quest Giver: Serinar — Maw of Neltharion, Dragonblight [37, 31]
Objective: Use Neltharion’s Flame to cleanse the summoning area in the back of the Maw of Neltharion, then kill Rothin the Decaying and return to Serinar.
Quick Facts
Walkthrough
Getting to the Summoning Area
Using the Flame and Fighting Rothin
/tar Rothin to locate him and plan your route through the cave.
Efficiency Tips
Lore Context
Serinar is a black dragon in human form defending the Obsidian Dragonshrine from the Cult of the Damned, who have been desecrating the bones of dead black dragons. He’s unusually cooperative for a member of the black dragonflight, though he still condescendingly calls you an “effective tool.”
Rothin was resurrecting the ancient remains of black dragons as Magmawyrms to serve the Scourge, a particularly offensive act to Serinar since these are the bones of his brood.
The reward Lord Prestor’s Drape references Lord Daval Prestor, the human alias Neltharion/Deathwing used to infiltrate the royal court of Lordaeron. A fitting nod, given this quest takes place in the cave bearing his original name.
Cross-Expansion Connections
Serinar’s Fate
Explore Dragonblight’s hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Dragonblight Chronicles, along with the complete quest storyline.
Vikstone's War Journal“It’s time to strike at the source of the corruption.” Serinar gave me a vial. “Rothin the Decaying is resurrecting black dragons as magmawyrms in the back of the cave. Go to the summoning chamber and cleanse the remaining bones in the only way that they will never be toyed with again. With flame.”

Neltharion’s Flame was dragon fire distilled to liquid, hungry for something to consume.
The Maw of Neltharion stretched before me, the bones of ancient wyrms scattered across the cavern floor. I walked over what remained of Serinar’s kin and the walls still bore the shadows of snuffed runes, the silence of culled cultists.
The summoning chamber: a wide space where Rothin worked his craft, half-assembled magmawyrms surrounding him in various stages of corruption. He was so focused on his work that he didn’t see me until I poured the flame across his bones.
Dragon fire roared to life, consuming everything it touched. The half-raised wyrms crumbled to ash.
“No… NO!” Rothin spun, his eyes wide with fury. “What have you done?! So many ancient wyrms wasted… what magic could do this?”
“Neltharion’s,” I said.
“Foolish errand boy!” He gathered shadows around himself, the Aegis of Neltharion flaring to life. “You will die for interrupting my work!”
He threw shadow bolts that burned cold where they struck. Shadowflame erupted in cones that forced me to circle, closing the distance between spellcasts. The aegis made him harder to hurt, but not impossible. Each swing of my axe carved through his defenses until the barrier shattered and the man beneath was just meat.
“This is not the end…” he gasped as he fell. “Death only… strengthens…”
Whatever dark promise those final words held, it wouldn’t be kept today.
Serinar received my report without his usual contempt. “You are quite an effective tool. Your hand in this purging is appreciated. The bones of my brood have been spared this filth.” He inclined his head. “You have served me well.”
High praise from a black dragon. I’d take it.
Rothin was dead and Serinar sent him to Nalice at Wyrmrest with a message, though what the black dragonflight wants reported and why comes out in Tales of Destruction.