Omen is an Undine, the elemental race of water is warring against the Seldane, the elemental race of earth. The humans are either the fifth element, none of the elements, or a mix of all of the elements. If one of the elements were to claim the humans as their own, they would destroy all of the other elements, and destroy the reality of Cythera (in the book about the Cipher manuscript you read), and destroy nearby realities as well. Only by healing Alaric can you prevent this from happening, for he sits in the balance between east and west, earth and water, seldane and undine. Get all of that?
I don't get the Chimera part. I know that it's the name of a really cool plug-in for Myth II, that's it. Anyone who has read the Cipher Manuscript get that "The Dr. E. W." part that the translator didn't understand? That manuscript really gives you a mouthload to think about if you've played the game and beaten it already.
The Undine can also shift shapes. The sequel of Cythera (I've got a feeling that it will definitely come) will involve the Undine once more, by a dead hint during the game.
I don't practice what I preach because I'm not the kind of person I preach to.
(This message has been edited by glaive6 (edited 02-14-2000).)