This type of ring allowed its wearer to cast additional arcane spells each day. Some increased the number of lower-level spells available to a mage, while others offered a lower number of additional high-level spells.
The creator of these rings was rumored to have arcane powers that defied the rules and limitation set by the goddess of magi herself, Mystra. Eventually the "everlasting memory" this mage possessed was revealed to be a hoax, and the source of his magical prowess was revealed to have come from the rings he bore.
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