They are a humanoid species who were very advanced and developed the ability to create genetically engineered worker beasts to serve them. However, something happened and the animals, named Exomorphs, turned against their creators. This 'rebellion' of their creations nearly destroyed the Idryll civilization before they managed to shut the animals down. This act effectively removed them from being a spacefaring species and reverted them into a pre-warp civilization. One such rebel cabal attempted to restart the Exomorphs and succeeded. This group was stopped before their plans came to fruition.