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The guy from Zam you see me chatting with gets 100% credit for helping me so much with this and locating it. They are working a comprehensive guide which I will post later.
Located here (12823, 3857)
It is located on the wall there. Little shiny plaque. It does take awhile to find
Puzzle has two floors and is very simple once you figure it out...I will not spoil it until I see Zam post their guide. it does have two floors
Second floor looks the same as the first, but different pattern
Once you finish you get some plat, lesser essence THAT IS BIND TO ACCOUNT!~!!!!! Also you get this companion that has a name work in Progress. Greater Fire Spirit
You may know this pet from the concept art