This egg was only available in Egg Cave's Cash Shop Park for July 2012.
Slysal eggs make weird vibration noises very frequently. They also occasionally shake and throw themselves across rooms. As a result, Slysal eggs are quite difficult to sleep near.
Slysal are masters of mayhem and know how to cause trouble. Their favorite thing to do is retreat to hidden nooks and crannies and then jump out toward their victim all at once (it's quite frightening). It's tough fighting off swarms of Slysal, because they enjoy pulling and hanging on to things like hair and clothes.
In general, Slysal are harmless and difficult to dislike because of their energetic personalities.