Can you control when they are emitted? If so, it would be handy when outside in the cold. Otherwise... no.
Do I have a hypno-ray?
Downside? What downside? That's awesome!
Would this make me immortal? I think this would make me immortal. My choice is going to be based on that assumption.
Kind of like Destroyman from No More Heroes.
As immortal as a teddy bear. Teddy bears do wear out and wreck. Especially if they are walking around. Easy to fix, I suppose.
Since it says the words "at will" (which means you control when it happens....) then yes.
Where should this comment appear?
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Whenever "Your body dies but your mind is transferred to a ..." appears