A colossal species of leviathan once inhabited the coral moon of Rugosa, prior to a cataclysmic event that evaporated its oceans. During the era of the Clone Wars, a skeletal structure persisted on the moon, which then became a habitat for a group of neebrays that settled within the ribcage.
The leviathan's remains were featured in the 2020 short story titled "Sharing the Same Face," which was penned by Jason Fry and included in The Clone Wars: Stories of Light and Dark anthology.