Norn Stones are stones with magical properties. They have the power to satisfy the desires of its user and was often used for Loki's conspiracies. Use Norn Stones to increase character masteries and make own characters more powerful.
There are 4 basic types: Strength (Combat), Energy (Blast), Brilliance (Speed) and Omnipotence (Universal). There's also Norn Stones of Chaos, which are primarily used in Character Advancement.