My party is in the middle of the Malachite Fortress and has just fought Kozmojen. They ended up killing him and his pet and then performed a fighting retreat to get out of the Malachite Fortress alive. My question is what will the remaining hobgoblins do now that their employer is dead? Will they clear out or see the Malachite Fortress as theirs now and fight to defend it? What does everyone think?
Well, do the Hobgoblins know that Kazmojen has been killed. If they are in the PC's path on the way out from the Kazmojen fight, they may not know that their leader has been killed.
Of course, if the PC's are carrying something that is very clearly supposed to be on Kazmojen, then the Hobgoblins could be enraged for the PC's killing their leader.
It totally matters on what happened up to the point.
How this idea: the Hobgoblins seek employment elsewhere, like with Drakthar! It makes total sense for them, if you think about it.
Hanging out with other goblinoids, making a profit, hooking up with a strong leader, beating up on little goblins, man would being a hobgoblin rock. Except for those meddling kids, I mean, adventurers...
Well, my group left two whole hobgoblins alive. (This was before Drakthar's Way existed--that's a great suggestion.) What they did in my game was the two of them had a fight to see who was the new leader of the tribe. The two of them then successfully negotiated with the party for survival. They will be spending time in the underdark, but are going to be working on rebuilding their tribe in a less slavery-ring type of way.