Syld - you find that the strange gem you collected from the illithidkin is a Psionatrix of Telepathy.
-----
Upon entering the temple, you can see that another hidden door, this time in the left wall, has been opened. Beyond is a corridor lined with archways, which lead into what appear to be sleeping quarters. None are currently occupied, and there are a dozen archways that you can see. The corridor ends in a solid stone wall.
-----
Meanwhile, in the back room, Jirlai and Tori'shel remain seated and bound. As you re-enter the temple, Jirlai nods at you, evidently indicating for you to pause. He nudges Tori'shel with his elbow, who then gets an annoyed look.
"They won't believe us..." Jirlai nods, a look of insistence on his face. "Oh, fine." She then looks to the group.
"Jirlai is convinced that, if we don't hurry, the illithid will be here soon." As Tori'shel speaks, Jirlai nods slowly. "I remember Ratheqar saying something about our need to hurry, because the illithid knew of this place and were preparing to attack it... but I'm not sure if they would do that now."
She pauses, gathering her thoughts. "I know that... we aren't exactly on agreeable terms here. However, in this, our goals share one facet: we all know that if the illithid get ahold of the Psionicle, then it's all over. Even you would more than likely prefer it being destroyed over it falling into the hands of the illithid."
"Jirlai has a rough idea of what you're going to be up against. There are quite a number of illithid planning to hit here soon. You're going to need as much help as possible."
Jirlai nods. Tori'shel continues. "We can help you. Our goals for the Psionicle may differ, but neither of our groups here wants the illithid to get it. If you let us out of our bonds, we will assist you in fending off the illithid. Afterwords, we will go our seperate ways."
"Give me my devices. Give Jirlai his... magic stuff, and his staff and wand. We will be too busy fighting illithid - when they come - to turn them upon you."
She shrugs. "Of course, you can choose not to believe us... but Ratheqar has been following the pieces and history of the Psionicle for a long time. I think that he knows what he is talking about - and if he says that the illithid will attack, I would believe him."