What is this power?

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Across
  1. 4. Knight, to a damsel
  2. 5. One of six in this clue
  3. 6. Gem
  4. 8. Pick up on
  5. 9. Ignite
  6. 10. Drive away
  7. 11. Travel sci-fi style
  8. 12. Own, so to speak
  9. 14. Word with star or navel
  10. 15. Impulsive
  11. 16. Whack, biblically
Down
  1. 1. All the ___
  2. 2. House of mirrors at a carnival, for one
  3. 3. (2 words) "Achilles heel"
  4. 7. Article about family's philosophy
  5. 13. Something that might be felt at a séance