Please be noted this article needs improvements!
Causes: Needs a screenshot, try hunting. Experimenting must be done.
When you lay your cat to sleep each night, there is a 1 in 4000 chance to wake up in StarClan. Because of this, there's only been a couple of people who have seen StarClan before. You won't be able to do anything in StarClan except for talking to a cat near a lake.
When talking to the cat, he/she will usually say, "Hello ______. I really like this lake. You will now wake up at Fourtrees." Right after, you are teleported to Fourtrees instead of your Clan's camp.
StarClan also gives you gifts if you go to the Moonstone.