The only way seems to be to capture them from bosses using them.
So the goal is to make a list of the Elite skills used by the different bosses in the various areas.
<SKILL> : <AREA> (<NAME OF BOSS>)
Name of boss isn't essential, but better if you know it
I will need your input on the ones you find, but PLEASE, only reliable information. If you're not sure about one, please check it before posting.
Waiting for your input, guys
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Devastating Hammer : Iron Mines Of Moladune (Martigris The Stalwart)
Illusionary Weaponry : Talus Chute (?), Iron Mines Of Moladune (Dirko Mustalker)
Mark Of Protection : Iron Mines Of Moladune (Lokar Icemender)
Mind Freeze : Witman's Folly (?)
Mist Form : Iron Mines Of Moladune (Eidolon)
Poison arrow : Witman's Folly (?)
Word of Healing : Elona Reach (?)
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Elona reach is in the desert.
Talus Chute, Witman's Folly and Iron Mines Of Moladune are in Southern Shiverpeaks. You access them after the desert and Ascension.