The Ketran are a fictional race from the Animorphs book series; they lived on giant crystals hovering above a lava-covered surface. The Ellimist was once a member of this race. The Ketran were later wiped out by the Capasins.
The Ketrans kept the floating crystals afloat by having a lot of people flapping their wings while attached to the crystal.
A large amount of the Ketran's society was based around a game, akin somewhat to God sims of our video games. In this game, the player would choose a species and make small changes to the planet and to genetic structure, etc. of the species, then see what the outcome was.
It was this game (broadcast throughout space, much in the same way that humans broadcast messages about their society via radio waves) that caused the Capasins to come and wipe them out. The Capasins believed that the Ketrans played with the lives of real species, they didn't realise it was a game (indeed, they couldn't grasp the concept of games.)
The last of the species escaped with an experimental spacecraft made from crystal, onboard was the one who would become the Ellimist.
Ketran now put effort into his foreward leg, raising himself up into a position of defense, his blade held at the ready as he waited for the reaction of Cross to his attack.
Ketran held his feet shoulder width apart, and held his dark gaze upon the warrior who now landed a few feet from him and launched himself in the air.
Ketran said, knowing that their friendship was one of the few things to survive the Advocate conflict, besides themselves.