I'm farming public dungeons and am seeing some odd drops from the bosses. There is an area where three bosses are very close together. I thought there was a timer that prevented you from getting item drops from bosses killed one after another. So I've been waiting a couple minutes between kills.
This morning, however, I killed two within about 20 seconds of each other and got an item drop from each. But I killed a third about a minute later and got nothing but gold.
How exactly does this work?