I dunno

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Across
  1. 3. A creature that has been theorized to exist without scientific evidence
  2. 4. The counterweight on a sword
  3. 8. Pertaining to the stars
  4. 10. Resentment at unfair treatment
  5. 12. After second breakfast
  6. 14. Among the deadly sins
  7. 16. A network or interconnected system
Down
  1. 1. A burn from liquid or steam
  2. 2. Connects arteries and veins
  3. 5. Shift minus
  4. 6. Both a fruit and a bird
  5. 7. To murder for political reasons
  6. 9. A large tropical fruit without a tree
  7. 11. To confirm as truthful
  8. 13. A preamble or introduction
  9. 15. A parasitic arachnid