Drakuru in Voltarus wants you to speak to Gorebag and take the tour of Zul'Drak.
Ahh, another supplicant answerin' da Lich King's call.
<Drakuru sniffs you.>
Freshly scourged, eh? Ya still be reekin' of da living!
Long be da line of dem who seek da Lich King's blessings. Ya must rise above da masses and prove yerself worthy of wieldin' true power.
Lookin' down over Zul'Drak, I sensed potential in ya. I ordered your - invitation.
Da rest be up ta you....
Go an' speak ta Gorebag for a tour of Zul'Drak. Dere be much ta do if you're to be of any worth to me.
The following spell will be cast on you:
Have ya taken in da battlefield yet, mon?
So, now ya be seein' what we be up against, mon.
I want ya ta go down, learn da land, mingle with yer bretheren. Prepare yourself...
Soon, dere be much for ya to do. Don't ya be disappointin' me!