From the publisher:
What is about a foot tall, has horns, a tail, and has hands as big as a man’s? …The kval, and they are about to invade your game in droves. When the balance of power suddenly tips towards evil, the world itself expels those responsible and the surrounding land it into a prison-like demiplane. In this isolated pocket dimension, the kval appear and begin to slowly multiply, destroying and consuming the fiends and eventually purging the infested land. Then, when the process is complete, the kval are deposited back into world in great numbers; thus maintaining balance. Kval, however, don’t stop there. They quest to find and defeat evil wherever it may be. Introducing the first working Tiny-size 4E pc race, the kval are certain to raise notice.