Percy Jackson, the thief?

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Across
  1. 2. Percy's mum
  2. 6. god of the underworld
  3. 7. god of the sea
  4. 8. Percy's boarding school
Down
  1. 1. casino car
  2. 3. Zeus' weapon
  3. 4. god of the sky
  4. 5. the lightning thief, we think