Doomsday's Devilish Details

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Across
  1. 1. Shows your reflection
  2. 4. The organ you are using to solve this puzzle
  3. 5. One hundred years
  4. 6. Stay alive in a tricky situation
  5. 7. Can't be seen, like Harry under his cloak
  6. 8. Jewelry that is worn on the finger
  7. 10. A shape with three sides
  8. 11. To multiply by two
Down
  1. 1. A very high hill
  2. 2. Very pretty, appealing
  3. 3. The largest planet in our solar system
  4. 9. Fragmented, not in one piece
  5. 12. Very dark, lacking any hue or brightness