Trials of Apollo The Hidden Oracle by Rick Riordan

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Across
  1. 3. child of Poseidon
  2. 4. an "immortal" Roman emperor
  3. 6. one of the five oracles
Down
  1. 1. self-centered God of the sun
  2. 2. child of Demeter
  3. 5. grain spirit, pet of Megs