This is my entry for an S class mage, since you said there were a few of them in the guild and I figured "why not?"

Name: Artemis Nexus
Age: 27
Gender: Male
Appearance: 
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Personality: Calm, Patient and Intelligent. Not necessarily 'kind' or 'warm', but he has his own way of helping people. There is nothing he loves more than sharing or gaining knowledge.
Biography: 
Magic: Holder
Artifact: The Dreamtide
A book that, in anybody else's hands, is nothing but a block of paper with unreadable symbols on it's pages. When held by Artemis, however, the book becomes a deadly weapon, with many magical properties, some of which he doesn't even know of.

Dreamspace: A pocket dimension inside of the book, capable of storing nearly anything, similar to a Requip mage's space. Currently there is only one thing in the book.

Magic Sword, Shimmer: A sword which Artemis found inside the Dreamspace when he opened it. The blade can cut through anything, provided that object has no thoughts.

Dreamcatcher: The book can generate a shield that stops anything with thoughts from passing through.

Dreamreader: The main ability of the Dreamtide. Dreamreader can "read" Any spell that has been cast and display it on the pages of the book, allowing Artemis to examine and decipher it. Given time, it also allows Artemis to dismantle or re-purpose the spell. These spells can also be recorded in the Dreamtide, and cast by Artemis at a later date, though they take more time cast by him than they would cast by the original mage.

Along with these properties, the Dreamtide also provides Artemis with enhanced speed and strength, making him a match for many of the monsters in Fiore.