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There are 3 hidden/triggered vendors (Crystal Pond, Caretaker's Cabin, and Hermit's Hideaway) Each of these have 3 special offers.

Locations: http://www.youtube.com/watch?v=LNaBkj7dOww

May also want to add not to shoot the small bugs at these Arkfalls, as they add the weak spots to the crystals.

Sorry just saw this was already mentioned (missed the post)

Thanks very much :)

Ahh not just me then.

Lets hope for a fast fix.