This trope, in essence, is Exactly What It Says On The Tin: A character is made out of the series' resident Unobtanium or Green Rocks. Super Trope to Man Of Kryptonite.
Examples of this trope:
Hello, Unkown Troper. You'll need to get known to lend a hand here.
Three days must pass before this YKTTW is Launchworthy or Discardable