[Act V] The Enigma - Blue Binding Source

[Shin Hiryō Tensei]

So, I am inside The Enigma (...) and I cannot go further.
I solved all the puzzles (I think; it took me something like three whole days), even the big one. Now, there I need seven blue crystals (seven "Blue Binding Source").
I have, in my inventory, SIX blue binding source - plus another one put it on the entrance of the Pyramid where the portal to golarian stays. I cannot remove that one because it is required to keep the doors open; I don't know where the hell is the seventh crystal I need.
I killed the minotaur behind the illusionary wall; I killed the Master of Undead (the mini-boss which spam Wail of Banshee and Dimension Door). I backtracked ALL the temple but I found nothing nor I left a crystal behind.

I don't know what to do.

[Kurosu]

That quest/area is ♥♥♥♥

I would not be surprised if your final stone just bugged or something

My advice : since you did the rest of the puzzles anyway, I would advice you to just add the stone with toybox

[BaptismByLoli]

1 of them is hidden behind a fake wall. Maybe you failed a perception check in which case go out and go back inside? The fake wall in question is the one with the 2 snake heads taking turns breathing stuff out on the West side of the map. The room that requires a lot of Blue crystals

[LordSith]

Beware, the blue binding crystals are all there, but some are hidden, some are in the "shadow" part of some rooms you may have already visited.

My recommendation is to go back to every room and check EVERY corner.

My missing one was in a room in one of the sub area, in the opposite side of the room: my battle didn't take me so far so i didn't know that there was still some fog of war in that area.

Edit: i had to do 3 sweeps of the whole area before noticing that i may have been forgetting to check back in the sub levels... (because i thought there were none at those places).

The only blue bindings you cannot take back are those opening the doors to the middle room iirc. Other than those, you can take (and should) back any of those.

[Shin Hiryō Tensei]

I found the last one behind...an unexplored area. I didn't explored that very area TWICE.
My bad.

Thanks for your replies.

[Jaereck]

Originally posted by BaptismByLoli:

1 of them is hidden behind a fake wall. Maybe you failed a perception check in which case go out and go back inside? The fake wall in question is the one with the 2 snake heads taking turns breathing stuff out on the West side of the map. The room that requires a lot of Blue crystals

This was the solution for me! Thank you!

[hilburnashua]

Arrrgh. I spent so long looking for this. I didn't realize the sand on the right hand side of of the stairs up from the third platform was a ramp up to the area with third stone.

[Primaço]

Originally posted by BaptismByLoli:

1 of them is hidden behind a fake wall. Maybe you failed a perception check in which case go out and go back inside? The fake wall in question is the one with the 2 snake heads taking turns breathing stuff out on the West side of the map. The room that requires a lot of Blue crystals

How much perception does the character need to discover this secret area?! I know the seventh blue stone is there but my character with the highest perception only has 28! What do I need to do?