Can be found in the Calpheon Elite are west of Treant Forrest. "A hand in the middle of the rooms, with a chain on it"

there are no hand at Kzarka Shrine at west of treant. provide screenshot if u really found it

I found this at one of the north most structures. If you start from Trent, go North last structures. There is Hands everywhere in there...

Confirming what Psycpziz said. There are atleast 3 Hand of Kzarka down there, probably more but I get lost down there. Everything looks the same. Screenshot of entrance.

It would appear that it is only available certain times, as of right now there's just a Kzarka corpse at the place. I'm guessing near kzarka spawn/or after.

there is at least 4 entrnaces. 2 on top of trent and 2 on top of lumberjacks rest area. go to the ones in lumberjacks rest area. u will at least find 3 hand of zarka and is easy to notice. where the hand of zarka is, there are black spirits going round in circle also known as aura of failed zarka just use ur main power that kills in 360 degreee if u have any or randomly attack in circle. u will eventually kill it. it took me 5 mins. as for the calpheon shrine pillar, there are almost everywhere, just attack any pillar u c inside the cave.

http://imgur.com/a/WBFAh

it's in one of the northern caves, we spent a lot of time looking for it, it's where I am on the map (give or take) and there is indeed multiple

Location and what the mob looks like can be found here:

https://youtu.be/2tpCZhpLdeM