Dialogue between Arthas and Tichondrius in WC3.
Arthas: What trickery is this?
Arthas: Mal'Ganis! I don't know how you survived, but I will--
Tichondrius: Calm yourself, Prince Arthas. I am Tichondrius. Like Mal'Ganis, I am a dreadlord, but I am not your enemy. In truth, I've come to congratulate you.
Arthas: Congratulate me?
Tichondrius: By killing your own father and delivering this land to the Scourge, you have passed your first test. The Lich King is pleased with your...enthusiasm.
Arthas: Yes. I've damned everyone and everything I've ever loved in his name, and I still feel no remorse. No shame. No pity.
Tichondrius: The runeblade that you carry was forged by the Lich King and empowered to steal souls. Yours was the first one it claimed.
Arthas: Then I'll make do without one. What is the Lich King's will?
Tichondrius: The Cult of the Damned must be rallied once again. Many of the acolytes have been in hiding from the populace. Once you've rallied them, I will give you further instructions.
Frost DK Artifact Questline (Purge the last remnant of Arthas's Soul from Frostmourne)
Start at 8:30