Happy Halloween!

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Across
  1. 4. A memorial marker
  2. 8. A witch's cooking container
  3. 9. Hoped for treat
  4. 10. A magical mixture
  5. 11. An eight-legged weaver
Down
  1. 1. Mr. Bones
  2. 2. Prof. Lupin's alter ego
  3. 3. The gourd of the season
  4. 5. It's a wrap!
  5. 6. Hopefully it's a friendly one
  6. 7. He wants to suck your blood