Ragnarok!

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Across
  1. 4. Surtr will slay this god
  2. 7. Heimdall will blow this horn to signal the apocalypse
  3. 9. Thor's sons will take up this hammer
  4. 10. He will slay Heimdall
  5. 14. Tyr will slay this wolf
  6. 15. Odin will consult this head for advice
  7. 16. The three-year winter that precedes Ragnarok
  8. 18. The spear Odin will carry into battle
  9. 19. This god and his blind brother will return from the underworld
  10. 21. The warriors who will fight at Odin's side
  11. 23. The apocalypse, meaning "Fate of the Gods" or "Twilight of the Gods"
  12. 24. Fenrir will devour this god
  13. 25. The surviving gods will play this game after Ragnarok has ended
  14. 26. Two of these animals will devour the sun and the moon
  15. 27. Loki's troops, the dead, come from this realm
Down
  1. 1. The ruler of Muspell, a fire giant with a flaming sword
  2. 2. The rainbow bridge destroyed during this time
  3. 3. The world tree that will shake during Ragnarok
  4. 5. The giant wolf who devours Odin
  5. 6. The ship made of the fingernails of the dead
  6. 8. He will slay Loki
  7. 11. Odin will ride this horse into battle
  8. 12. Thor will slay this serpent
  9. 13. The battle plain of the apocalypse
  10. 17. Vidar will avenge his father using a giant one of these
  11. 20. This natural disaster will free Loki and Fenrir from their bonds
  12. 22. After the world has been destroyed, this is the plain that will exist where Asgard once stood