MSM ultimate challenge

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Across
  1. 3. plant island mythical
  2. 5. water + cold
  3. 7. plant island ethereal
  4. 8. There are 3 classes of monsters. Common, rare, and ____
  5. 10. last single elemental you get on plant island
  6. 11. monsters which come out of the ground
  7. 13. the iconic monster
  8. 14. The only single elemental unavailable on plant island
  9. 16. big famous robot
  10. 18. First monster you get
  11. 20. The company which made MSM
  12. 21. hyena mythical that laughs
  13. 22. single elemental fire monster
Down
  1. 1. Cold single elemental
  2. 2. cold + earth
  3. 4. plant + water
  4. 6. wublin which says it's own name
  5. 9. the first island you get
  6. 11. plant + air
  7. 12. plant + earth
  8. 15. "Just keep your feet on the ground" is part of the lyrics on _____ island
  9. 17. "Wake up the wublins!" is this monsters line
  10. 19. Single elemental with lots of toes