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The Dallens are a mysterious spacefaring race who once colonized Annyrion, several thousand years ago, then abandoned the planet. Archaeologists have pieced together some information about them.
The Dallens were a herbivorous species who were militantly hostile toward carnivores. They ritually hunted and sacrificed carnivorous animal species. Their empire appears to have fought multiple wars against intelligent races of carnivores and omnivores. It is known that Dallens enslaved some omnivorous species, such as the Eisshari, but were unable to co-exist with pure carnivores in any way.
The reason why the Dallens abandoned Annyrion is unknown, but the Eisshari they left behind formed a primitive (bronze age) culture which persists to the present time. The location of the Dallen homeworld or other colony worlds is unknown, and it is not known whether the Dallen civilization still exists somewhere in our galaxy.