Plus it is magical, the rules of death are cheated by the magic armor regardless of the system you are in, have it do whatever fits your game. Give them real damage after -10 and let them die of unconscience pummeling (if people even do that) if that is your wish, or say the magic saves them, doesn't really matter in the scheme of things. Magic will do as magic does or as you desire. Go to Comment
If stolen, I assume that the beaten person would still be revived since the armor already did what it was suppose to, ie. convert it to subdual damage. So they would heal, albeit a little slower.
Give it to the enemy. Especially one that was difficult and has been causing them much problems. If they take the armor, fine, if not, then all the better. Either way, "Johnny's back." Great way to bring back your favorite villian. Convert whatever they are wearing to this. Ta da. Go to Comment
I like the conspiracy angle.
If anybody did find out about the armor and wanted to fake their own death....
Perhaps given as a gift to somebody who is then "assassinated" but really kidnapped.
Man in the Iron Mask type deal where somebody must be "murdered" to protect them from true murder. Go to Comment
The initial possession should cause some damage and be painful, sort of like ripping out your essence. From the outside it could look like somebody was being shot by arrows from many directions, one at a time causing their body to convulse to each new hit. It is basically a fight of mental strength, the new spirite fighting the current owner. They should have a chance to resist, albeit a low one. Once done they should be weakened (lower HP) whether or not the spirit took over.
And after a few hours, you could even say that your *true* spirit that got thrown out had to learn the ways of the spirit world so it could try and get back to their body. So the time of possession could depend on the intelligence of the person. A very intelligent person would only be gone for minutes perhaps. They being the natural owners of the body have an easier time re-possessing it so they get even more bonuses to re-entering their own body. Should be a chance to failing again though. Go to Comment
I would posit that the root and leaves have a similar effect when accidentally consumed, but are differently used in the rituals or secret recipes. The 'Actual Effects' are what this plant really does and can go wrong (with side effects of course).