Kedge Keep is good from the early 30s up to 50 if you've got some enduring breath on the go.
South Karana is less populated, 20ish - 35, and into Splitpaw.
Spectres in OOT will probably be quiet from 38-45, as most people will tend to go to the Oasis or Feerott ones.
Never done much in Permafrost, sounds like a good time.
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