Tower of Nero

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Across
  1. 6. the object to which a life force is tied to
  2. 8. name of the son of Hades who can shadow travel, originally from the Percy Jackson and the Olympians book series
  3. 10. the grove of sacred oaks that could speak and give prophecies
  4. 11. the name of the leader of the troglodytes
  5. 13. the giant snake who is the main protagonist
  6. 15. Apollo's name while in the mortal world
  7. 16. the Greek god of wine who oversees Camp Halfblood
  8. 17. Apollo's main instrument on the mortal world
  9. 19. the name of Nero's youngest 'son'
Down
  1. 1. the race of fierce warriors from the Roman Republic
  2. 2. ancient burrowers who helped disable Nero's traps
  3. 3. one of the 7 main protagonists of the Heroes of Olympus series, who died to help Apollo
  4. 4. the last name of Demeter's daughter whom Apollo was traveling with
  5. 5. the type of lizard that was brought to ancient burrowers as a gift
  6. 7. name of the gas that Nero used as a backup plan to kill Nero
  7. 9. Apollo's twin sister and the only Olympian happy with Apollo's return
  8. 12. the place where Apollo talked to Styx
  9. 14. the the titular antagonist
  10. 15. Meg's old friend from when she lived with her step-father
  11. 18. a son of Apollo who can glow in the dark and heal