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The object is not a crystal at all, but some form of organ, encased in ice. As you touch it, your hand reels in horrible pain. You feel as if your hand has been cut, yet there is no visible wound. As you collect your thoughts, you hear a young boy’s voice nearby.
You really shouldn’t have done that.
Investigate the nearby voice in Naz’anak, the Forgotten Depths.

Quest Giver: Auto-accepted after interacting with the Pulsing Crystal during A Short Fuse
Objective: Investigate the nearby voice in Naz’anak: The Forgotten Depths. Find and speak with Matthias Lehner.
Quick Facts
Walkthrough
The Revelation
Finding Matthias Lehner
Matthias’s Dialogue
Efficiency Tips
Lore & Secrets
First Meeting with Matthias Lehner
This is one of WotLK’s most important lore moments. Matthias Lehner, whose name is an anagram of Arthas Menethil, is a ghostly child who represents the last remnant of Arthas’s humanity.
He appears as a boy because he embodies the innocent child Arthas once was, before Frostmourne, before Stratholme, before the Frozen Throne.
The “organ encased in ice” is Arthas’s literal heart, which he cut from his own body after defeating Illidan Stormrage and ascending to the Frozen Throne. He discarded it here in Naz’anak because he believed having a human heart made him weak. By touching it, you established a mystical connection to whatever humanity Arthas once had, and that connection is what summons Matthias to you.
Matthias never refers to the Lich King by name throughout the entire chain. He only says “he” or “the prince,” speaking from the perspective of a frightened child who watched his own identity be destroyed.
He got out of the game. Matthias Lehner appears in the Warcraft Trading Card Game, which is a rare thing for an NPC with few lines and no combat.
The Novel Connection
In Christie Golden’s novel Arthas: Rise of the Lich King, an unnamed blond-haired boy exists within Arthas’s mind, urging him to resist Ner’zhul’s influence. This boy was not originally written as Matthias Lehner. A quest designer independently created Matthias based on a similar concept, and the two characters are generally understood to be the same figure despite being created without coordination between the novel team and the quest team.
In the short story Edge of Night, when Sylvanas Windrunner dies and glimpses the afterlife, she sees Arthas as a tormented little blond boy in the Maw, further reinforcing Matthias’s identity as Arthas’s soul fragment.
What Follows
The chain continues with Time to Hide (Matthias warns you to escape before the Lich King finds you), Return to the Surface (portal back to Thassarian), and then branches into the Matthias Lehner vision quests later in the Icecrown zone progression.
These visions include witnessing Arthas kill his own soldiers, the raising of Sindragosa, and the duel between Arthas and Illidan, before culminating in Tirion’s Gambit at the Cathedral of Darkness.
Explore Icecrown’s hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Icecrown Chronicles, along with the complete quest storyline.
You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain:
Vikstone's War JournalThe object was not a crystal at all. Some form of organ, encased in ice.

My hand reeled in horrible pain when I touched it. It felt as though it had been opened to the bone, and when I turned it over there was nothing on it. No cut. No blood. Nothing to show anybody.
That is the first thing that has ever marked them and left nothing behind.
“You really shouldn’t have done that.”
I turned and there was a boy standing on the stone. Pale, and very still.
“You shouldn’t have done that,” he said again. “He’s not going to like it.”
He. The boy did not offer a name.
His voice did not echo. I was standing in a flooded stone cavern underneath one of the largest buildings in the world, and the words came out of that child and simply stopped.
“I saw him get rid of it, you know? He threw it all the way down here. Said he wouldn’t need it anymore. Said it made him weak.”
The man above us made the other choice. I do not yet understand what is in that ice. I understand that I would not have let go of it.
The boy’s first instinct on meeting a living person down there was to tell him to run, and doing what he says is Time to Hide.