Klein Point is a very minute point through which the Gnosis would appear from imaginary into real space. Before the use of Hilbert Effect, hitting the Klein Point with a high amount of energy would be the only effective way of destroying a Gnosis. In Episode III, KOS-MOS uses her Third Armament to punch a hole through the Klein Point of the energy sphere encompassing Rennes-le-Château. This allows the party's E.S.'s, Dinah, Asher, Zebulun and Reuben to penetrate the sphere and enter the floating landmass.
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