During the conceptualizing phase of creating the "Legends of Saviors" titles, it was imperative to create the planets not just when the players would visit them, but the entire history of each one, as well.
Once the Khestlings (the Alpha Species of Jagg) evolve and understand that their world can be so much more, they end up using their water-controlling abilities to flood their planet, creating an even more diverse cast of flora and fauna!
LoS Concept Art | Jagg, Part 2 - Proto Phase Time-Lapse