Fantasy books/series

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Across
  1. 1. A prequel to a masterpiece
  2. 4. Ouroboros
  3. 6. A school of witchcraft and wizardry
  4. 7. A steel chair
Down
  1. 2. A trip through the multiverse
  2. 3. The first of them all
  3. 5. A wardrobe and a magical world