[MENTION=20323]Quickleaf[/MENTION]: So what did they do with the memory stone?
Well there was a bit of a conundrum because they weren't 100% sure this wasn't a last ditch trick of the abyssal lord or the product of a misguided secret sect. Still, they were as sure as they could be the stone was legit.
The fighter wanted to access the stone to learn the Lady of Pain's secret, and had dreams of making the Sensates the one true faction of Sigil and Left Hand of the Lady of Pain.
The wizard was cautious and considered trapping it in a Demi-plane (but what happens after the wizard died), destroying it (but what if LoP needed it in th future), or turning it over to the LoP (but what if it was a trap). I guess you could say the wizard suffered analysis paralysis.
There were also 3 power groups after the stone...
The sensate secret society (Sinerites) believed the stone was meant to be shared with the entire faction, and thus would free the LoP from torment. Their esoteric philosophy held that the original Sensates were supposed to share the pain with the one who would become LoP, but they faltered at the last moment. The Sinerites sought to set matters "right."
An astral deva, present during the ancient failed battle against the abyssal lord when the stone was used and the Lady came to be, also coveted the stone. He believed the Lady was actually an evil sorceress who sold her soul to the abyssal lord and then sacrificed hundreds to avoid her fate. By destroying the stone he believed it would send the Lady to her rightful afterlife in hell.
And Aoskar, the "dead" god of portals, actually was Mazed because he came close to finding the stone and using it to learn the Lady's weakness. The experience held in the stone, according to Aoskar, is bound to the nature of portals and planewalking. Aoskar wanted to open a great portal to another layer of existence, in essence a heretofore unknown plane and way of experiencing reality. He believed the stone held the secret to do that.
There wasn't any final resolution. The PCs decided to hang on to the stone, and since they had dealt with the other 3 power groups that knew of the stone, the Lady of Pain was content with that.