Note: I got this idea from a book the popped up on my newsfeed. I simply changed it up, so it wouldn't be exactly the same as the book.

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All of the ninja split from the team, all but Kai Smith he had stayed on the team to further his training. He was well aware of dark paths his friends had taken, although some had chosen to take a path that was still with the light. (Your OC) was brought to the team by the master of fire, who would be joining you on a special mission. To bring the team back together to defeat a new evil. Continue from there.