Dubh-Fhocla

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Across
  1. 1. Hirudo medicinalis.
  2. 4. A serviceable object during quarantines.
  3. 6. The Un-Dead.
  4. 7. I took over the torch from his hand, howbeit he forced me into the everlasting darkness.[TIP: you may solve this only after understanding 21-1.]
Down
  1. 2. Sligo, 1832.
  2. 3. She brought catastrophe on Earth.
  3. 5. Made by lamb haslet, round and relishsome.