Revelations from Keynote II

[Kalise]

I think Y'shtola just used a risky teleport spell and got "stuck", no? Her body/soul should still have been entwined, even in aetherial form. I think it's being awash in the great torrent that is the Lifestream for too long is what damaged her.

Not quite.

The "Risky" teleport spell WAS in fact meant to take her into the lifestream.

With the risky part being, it's not at all certain that you will actually get out again and, if unable to get out soon enough, your soul will just lose all traces and be part of the lifestream (I.e. Dead in the same manner that everyone (Eventually) dies and returns to the lifestream)

Though, there's not really much information about what happens to the physical body during this spell. Given that all the times where we see someone's soul separate from their body when they die (ALC quests for example) it does suggest that the body is left behind.

While with Y'shtola's (Forbidden) spell there was no trace of her at all at the scene, no body or anything aside from her Aethereal Trail.

So it's hard to say if she has a new body or the same one. Since, as far as I can recall, there's no other mentions of someone being able to enter the lifestream with their body. Ascians might have entered it but they give up their mortal bodies and then have to possess new ones. Even the story in Tam-Tara Deepcroft (Hard) is about creating a new body for her fiance because all she had was his head (Also, who tf just leaves a friend alone with their fiance's HEAD after he just died?) and his soul was in the lifestream.

There's certainly a possibility that she was able to bring her body into the lifestream and then it was pulled out with damage thanks to the brutal torrent of it. But at the same time, it's also equally possible that the spell would break the body down into pure aether in order to power a spell of such magnitude of forcibly shunting the soul into the lifestream along with an excess of aether to create a new body upon leaving.

It kind of surmounts to that whole Sci-Fi teleportation trope I guess. Wherein you have teleportation such as that from say, Charlie and the Chocolate Factory, where Mike Teavee's body is broken down into tiny pieces and then sent to the receiver and put back together. While on the flip side you have Star Trek where your body is broken down completely and a brand new one is replicated at the receiver.

Which one it is, it's hard to say with such limited information about the spell and the events when it was cast.