Allusions!

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Across
  1. 4. Self absorbed, for instance.
  2. 7. Monopolist (Dr. Seuss)
  3. 9. A fatal weakness. (DC)
  4. 10. A great success; baseball.
Down
  1. 1. A fatal weakness. (Mythology)
  2. 2. A Christmas grouch (Dickens)
  3. 3. Brings misfortune if opened.
  4. 5. An intelligent person.
  5. 6. A romantic person
  6. 8. A Christmas grouch