Halflings are a people without a home. They wander through the kingdoms of taller races, never staying to long in one location, always searching for a place to make their own.
The PCs discover a large white ball in the branches of a tree, or in a niche in a cave. Unless magically examined, or by a PC with a specialty in insects, it is a plain, smooth white ball. After a short time, it hatches and releases hundreds of spiders, cockroaches, some other nasty bug