Sirene is one of two Axons that players must defeat in Clair Obscur: Expedition 33, and they will have the opportunity to collect a variety of items while pursuing this powerful foe. Among those items are weapons, Pictos, and upgrade materials, and some players will undoubtedly want to find them all. This guide is written with those players in mind, and it will help them collect every item in Clair Obscur: Expedition 33's Sirene.