A Kith'rak, based on established lore, is a proud individual who seeks greater and greater favor with his Queen.
Here is this ultimate weapon the gith are all looking for. He believes the people in front of him have said weapon. All he has to do is kill them and claim it for himself. "Quedenos! Fry them!" Dragon breathes fire. You're all dead. Voss stretches out his hand and claims the weapon. 30 seconds tops.
So why would he just leave and let a petty subordinate kill your characters and claim this ultimate prize while he does something so mundane as to "inform" the rest of the gith pack that they've claimed the weapon and their search is done? Makes no sense. Kill the adventurers, claim the weapon himself, take it and present it to Vlaakith. That makes WAY more sense from a common, logical perspective.
Come on guys. Don't give me, "The characters don't think like logical, rational beings. They are extremists and fanatics."
