Clair Obscur: Expedition 33 is packed full of mysteries and secrets just waiting to be unlocked, and believe it or not, one of the biggest secrets in the game is hidden right in the very beginning of the game during the Prologue. There is actually a set of hidden weapons you can only pick up during the Prologue in Clair Obscur once you've entered NG+, and you can only get them if you happened to hang on to those Festival Tokens from your previous playthrough.