I can imagine the uses such a room could be put to by a later culture. They could barricade the convicted inside for a time to let them suffer, or perhaps throw newly initiated paladins or priestesses into the room as a sort of "test of purity." Hell, this could even make for a very interesting cell in a high-security prison. The person inside would be forced to remain in a near-constant state of meditation to avoid going insane.
Spawning lots of ideas, which is the important part. Well done!
Of all the magic items that I have perused on the citadel, this is one of my absolute favorites. The detail is rich, but not overwhelmed with fluff. The power is unique, and the limitations on its use creative and logical. I simply cannot say enough good about this item, so well done! I must find a way to use this one day.
Ouch. I like the imagery of the item itself, but the power itself is a bit "meh". It's basically an instant-death rod, with the added side effect of being unable to resurrect the person afterwards without great difficulty. Though I will say that the soul-shard undead could make for a fairly interesting lot, if played correctly.
Just an idea, but if I were to use these I would make the wand tear the soul from the mortal and manifest it as a sort of physical object -- perhaps a crystal or a glass globe. The attacker could then do with the soul what he wishes. He could shatter it into a hundred pieces and scatter them to the four corners of the world (good backstory for a campaign), or he could simply be a sicko who collects souls and keeps them in a room somewhere. Maybe he fancies himself to be a sort of god -- perhaps he even has a cult following whose souls he "harvests".