Re: desining a teleport-steal ability?
I agree with those that say you just add an additional limitation to Exoteleport to represent the random item selected.
As to the value of that limitation, it should depend on "how random" it is. Are you sticking to game-significant items only (i.e., defined as GURPS equipment) or is anything on the target fair game (i.e., you might end up with a penny in his pocket, or his left sock, or that piece of lint stuck to his shirt, or all those rocks you yourself referred to). If you get armor, is it his whole armor, or just a piece of the armor? Does a toolkit/first aid kit count as one item, or would you just get a single tool from the kit? Do you get both of his wireless earbuds?
If you're mostly sticking to game-significant items, I think you'd be in the -10% to -20% ballpark. If you're on the "anything goes", there is a significant chance you'll get absolutely nothing that helps you or hinders your foe in anyway, and you could easily place that limitation in the -40% or -50% range. I personally would never go below -50% even if I do throw in a lot of insignificant possibilities as there is always a chance to do hit something significant ("I tried it on Tony Stark and ended up with his Iron Man suit... sure beats the sunflower seeds wrapper I got from him last time I tried it.")
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