The backwardscrystal is the reverse of a crystal, but not totally in the way an anticrystal is. A backwardscrystal is a conductor of energy in the same way a crystal does, but in the opposite direction. This is due to a reversal in the brizomagnetic fields which flow across standard crystals. While the energy flows in the opposite direction due to this reversal, it in itself is reversed in order to facilitate this. A backwardscrystal and a crystal paired together will create a loop of energy which is effectively a perpetual motion machine.
Its importance in the GSOT is #12.