Tower defense bosses

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Across
  1. 8. ooga booga
  2. 9. yellow, is gone
  3. 11. solar eclipse, girl
  4. 12. undead shovel guy
  5. 14. catapult for the win!
  6. 17. reborn sword guy
  7. 18. renaissance
Down
  1. 1. quack
  2. 2. risk of rain 2
  3. 3. double head modern boss
  4. 4. evil christmas robot
  5. 5. cowboy skeleton
  6. 6. leader, royalty
  7. 7. green bull
  8. 10. pumpkin head
  9. 13. easy lightning boss
  10. 15. isc fire guy
  11. 16. fire guy