Start NPC: Arthgal
Your first job down here is going to be to kill the melee fighters patrolling the Halls of Utterdark. The devan outriders, assassins, and lokian reapers all carry scrips that Kurbain will find of interest. He's researching the hierarchy of the organization that's taken over here. Give him any help you can.
Oh, fantastic, I needed more of these.
You said Arthgal sent you here? Good man. He knows I've needed help here for some time.
Are you here for something?
Kill the Lokian reapers, devan outriders, and assassins in the Halls of Utterdark and collect their tokens.
Take the scrip to Kurbain in the northern part of the Halls of Utterdark.