Younger Brother's Folly
Leshii is a planet that should not exist, yet does. An amalgam of billions of cubic miles of water along with multiple planetoids ranging from massive continents to tiny islands, it is as malleable as it's primary inhabitants, the Unformed.
The creatures of Leshii came in every form and no form at all. Some, supremely adapted to Leshii's unique environment, perished and became extinct during The Reaving. Others were able to adapt to the simple environments of their new world even more easily and became deadly predators during The Rebalancing and The Long Gray.