The single most important piece of equipment to a death knight is the runeblade. It is through the runeblade that a death knight commands the powers of frost, blood and the unholy. The runeblade also acts as a vessel to store the death knight's runic power.
The time has come to create your first runeblade. Search the weapon racks on this floor and locate a battle-worn sword. Once found, take the sword to a nearby runeforge and use it to create a runeblade.
Well done, <name>. You have successfully created your first runebladed weapon. With it you will sow the seeds of chaos and destruction! In your wake will be a bloodied field of battle, littered with the corpses of all that would dare oppose the Scourge.