EMTERR
B.In the text
Mentions
3EMTERR
The Luzian prisoner should be able to reveal your best opportunity to assassinate the Grand Lich. But you'll need to see if EMTERR will trade for him in order to get him out of jail first.
EMTERR's junior negotiator mentioned a 'mysterious gap' that may have something to do with the Grand Lich's itinerary. Get him to reveal what it is.