This is the forum for helping you out if you're stuck or if you want to discuss the nitty gritty details of the dungeons within Mount Grimrock. Warning: forum contains spoilers!
Indeed Drax, the westernmost scroll was found down the pit.
Gamebanshee didn't have anything on it either from what I could tell of their walkthru - and their secrets page.
Tried the red gem, tried the green gem, tried them both, tried various weapons I had on me, armour, food, torches, bits of materials for potions. Didn't notice anything. Though if it opened up something on the other side of the level, I probably wouldn't.
I'm going with it's an unused asset until someone more patient than I figures it out.
Devil wrote:Indeed Drax, the westernmost scroll was found down the pit.
Gamebanshee didn't have anything on it either from what I could tell of their walkthru - and their secrets page.
I think the westernmost is referring to a pit to fall in from the floor above (where the timed puzzle is). Falling into that pit leads to a treasure.