For Daniel, My Lover

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Across
  1. 4. Imaginary number
  2. 5. Katherine's accessory (according to Floey)
  3. 7. Hit off John's debut album
  4. 8. May be a spirit
  5. 11. Subsurface ___
  6. 13. Ubiquitous continent
  7. 15. Sunk down deep in muck and ___
  8. 16. Eye of the Storm on the menu
Down
  1. 1. England soundtrack genre
  2. 2. Subway railing treat
  3. 3. Earth day mascot
  4. 6. Battleship background music?
  5. 9. Nightshade alarm
  6. 10. Donnie joined the CIA
  7. 11. Arachnid's juice
  8. 12. Firstborn as named by successor
  9. 13. Essentially (according to Abraham)
  10. 14. Hard or soft first letter