[Phoenix Flames]

Originally Posted by Mad King

I wouldn't consider the second point to be a reason he became evil (and I believe Pinestar's Choice indicated he may have been "born evil", though don't hold me to that. Tigerclaw's Fury hints his motive was fueled by Pinestar's abandonment, and that the Dark Forest influenced his actions because they led him to believe he would be a superior leader than the rest.)

He was grateful towards the patrol of ShadowClan cats that saved him and promised he'd pay them back someday, but his downfall came from his ambition. Tigerstar was too power hungry, and he didn't have the patience to wait until Redtail or Bluestar died naturally to become deputy and leader.

Yeah. I know.