At the end, you can turn Kunar in as a traitor. After you get the phrase from Z'Ant and tell it to Kunar, he gives you a fake pass. Go to Balbrak, talk about Kunar, and type in "traitor" when Balbrak asks "what about Kunar?". Then give Balbrak the fake pass. End of Kunar
Nightowl2
P.S. If you have someone with very good pickpocketing skills, you can nab Kunar's Key. It opens the door behind him and in the room is a one-way teleport to Martin's Bluff. Save first, because it will take several tries before you get the key.