The Mamathisk were an alien species that existed millions of years ago.
The Ellimist prevented the self-annihilation of Mamathisk, directing them subtly to productive peace. However Crayak reversed Ellimist's work and the Mamathisk reverted to cannibalism when they began to experience crop failures from a plant parasite. They were rendered extinct and one of countless of Crayak's victims for entertainment
- Ellimist Chronicles by K.A. Applegate