Under very special circumstances, it is possible for a Chao to evolve into a special Chao, named the Light Chao. The Light Chao is unique, and is refered to as a Chaos Chao; named after the beast Chaos.
Chaos Chao are special in that they are immortal; they will never die nor reincarnate, no matter what. Once your Chao succeeds in transforming into a legendary Chaos Chao, it will stay in that form forever. You should therefore choose wisely before pursuing this transformation.
Please note, the following will tell you the correct way to attain a Light Chao figured out within the Chao Island forums. For years, Chao raisers have not been aware of this correct method to evolve a Chaos Chao properly!
There are four general requirements that your Chao must satisfy in order to transform into a Chaos Chao.
- Your Chao must have reincarnated at least twice. This means it must be on its third life or more.
- Your Chao must have over 50 happiness. Happiness is a hidden value which runs from -100 to 100, and it is increased by caring for your Chao well. Your Chao must have had over 30 happiness to reincarnate, so you shouldn't have much trouble hitting this requirement.
- You must give your Chao at least one of every animal in its current life. Contrary to popular belief, you can give your Chao more than one of each animal. In other words, your Chao must have learnt every animal behaviour. The animals that you have given to your Chao in its previous lives will have no effect on this.
- Your Chao must be balanced, so that it would otherwise evolve into a Normal type. Your Chao must not be set to evolve into a Swim, Fly, Run, or Power type. This is how the false belief that you must give only one of each animal came about. Giving an equal amount of each animal is the easiest way to ensure this requirement, though.