Answer to the last riddle is: Silverstream!

My sister went on a quest to save the clans

She was given a prophecy

All of a sudden we couldn't do everything together anymore

She became a hero, a life-saver

I was stuck on my own...

Then I saved the clans from evil powers,

Risking my life every night

And still, I was considered a traitor by some

Who am I?

foxyfirephoenix, Mapleleaf72, SnowcloudOfIceClan, Kittywarriorsandgj and ravenleaf2011 commented the answer to the last riddle correctly! Answer to this riddle will be in the next chapter!