Stormbringer is the chaos blade previously owed by the efreet Azriel. When held by Valkyr it fills his head with a maddening humming noise and wildly morphs between different weapon shapes until he drops it. The party wraps the blade in cloth and keeps it with them.
Later it offers the party great wealth and power if they kill Freya and abandon their quest to restore the empire. The blade desires something located in the city of Telmec and wants the party to journey there. It says there is an evil army of order rising in the north and he will help the party defeat them if they do what it says. They party rejects the blades offer.