Make Goblin Slavemasters Drop Whips
Consistant with monster description/image
Basically, much like how Kobolds have an increased change to drop bows, Orc Scorchers spears, Gnolls battleaxes, etc. etc. Goblin Slavemasters should have a chance to drop whips.
Why? Because whips are really cool, but I never get to use them until at least the mid-game (if not late game) because they're so rare. Also, the other whip using monster (Balor) drops them, so...