Richard Stanley discusses Otto Rahn and "The Secret Glory"

Also the Spear (of) Longinus, one of the Arma Cristi artifacts. The Jesus' side was pierced with it.
In mystic teachings the Spear (the masculine) and the Cup of Grail (the feminine) create a couple. So to have the whole power one must possess both. Nazi seized the Spear on March 12th, 1938, the day he annexed Austria.