» Wed Oct 13, 2010 10:53 pm
The notion of it being akin to an egg is interesting as soul gems take many forms other than the dull blue stones seen in Oblivion. If soul gems are effectively condensed magic, they could be seen as mimicking the Aetherius, and as souls naturally seek to return to Aetherius, a construct which mimicked the Aetherius could be used to hold and contain them. All a soul gem would be, in this case, is an object which mimics Aetherius, be it a homegrown crystal or the Amulet of Kings, or possibly even an Argonian egg (perhaps that the egg contains an unborn factors into it?). Once bound to the Aetherial-echo, the soul's arcane energies can be tapped and manipulated as one willed. So, "morpholith" would be referring to "(magic/Aetherius in) stone form."
Perhaps the other crystals seen in the game represent other constructs made possible by mimicking Aetherius (as Welkynd stones don't seem capable of holding souls, but rather just energy, or the "power of Mundus" as Martin says.) By mimicking the Aetherial realm, they allow a skilled user to act and manipulate the world in ways they would not normally be capable of.
As for how Molag Bal falls into this, it's states that one of his pleasures is the harvesting of souls. He attempts to thwart or otherwise interfere in the natural cycle of death, be it through vampirism or just keeping souls from being able to make another lap around the arena. From this desire, he opts to show mortals how to harvest and condense the Aetherial elements into stones which can then be used to spread strife throughout Tamriel as well as messing with death. Of course, Arkay had to get in the way?
Also, I suspect that, though mundane objects may be able to contain souls, they don't act in quite the same way. Using Redguard's ending, if any object could contain a soul in just the same way as a soul gem, then why wouldn't they just try again when his soul went to the sword rather than the body? And why, for that matter, would people use gems rather than, say, socks and bobbins? Any objects may "contain" a soul, or at least its energies, but it is not in a usable format. It's simply there, as with a body. When in a soul gem, which mimics Aetherius, things are different, for the soul is preserved in a state of existence, still pure, awaiting its reuse by the dreamsleeve, and thusly in a form prime for use elsewhere, such as infusion into another item.