Cedarstar was a feared leader of ThunderClan, best known for nearly exterminating WindClan during a devastating attack. This attack led to deserters within his clan; those caught deserting never saw another sunrise. He had a small group of warriors loyal to him before anyone else. He, unlike so many other evil leaders, knew that a clan that never hunted couldn't survive, and that a clan without a medicine cat would not last long, so he allowed cats to hunt, have mates, and train as medicine cats. He even had warriors memorise herbs. His rise to power followed the mysterious death of the deputy, then the leader. The bodies were both found in the middle of the same clearing. After the battle with WindClan, when cats were deserting, they wound up in StarClan without anyone ever finding their bodies. RiverClan then ended up with a lot of piranhas. He managed to live for 212 moons, then a revolution started by an apprentice named Strawpaw killed him and all his loyal warriors. He went to the Dark Forest and brought several apprentices to the Dark Forest for the great battle. He got, trained, and killed Applefur. In case you can't tell, he drowned deserters, then piranhas ate the bodies.
I made this GIF on the website Photomosh I did not make the base art. The song is from The Greatest Showman