Im a lil confused... In the original game, WE (aka the cat we play as) kills firestar, Yet in this game im pretty sure it says that Littlebird killed firestar
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as the person above me said, it's part of the lore. I'm not completely up to date on the storyline and the wiki is quite confusing, but I've heard that sliverstone is just a figment of her mom's imagination. If that's true, someone else would have had to have killled firestar, and littlebird did want to kill firestar. someone else could probably answer this better but that's what I've come up with