The Yggsdrasil

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Across
  1. 2. C51H79NO13
  2. 5. An intelligent black bird
  3. 7. Large, detached, fluffy clouds
  4. 8. Low-level white clouds
  5. 11. An intense heat that collapses within itself
  6. 14. Aristotle's happiness theorem
  7. 16. Son of Noah
  8. 17. The highest peak
  9. 18. In order to become strong, one must maximise their full ---------
Down
  1. 1. Dark, grey and featureless clouds
  2. 3. The God of war
  3. 4. Every 75/76 years, its torment causes millions to suffer.
  4. 6. The five Chinese elements.
  5. 7. To be inflicted with misfortune, to be ------
  6. 9. There are 118 in existence.
  7. 10. To reach --- is to reach a state of peace
  8. 12. A bright light, followed by a booming sound hidden upon the clouds.
  9. 13. A tree spirit, and the end of all things.
  10. 15. A large desert region in South Israel