Operation: Gral mod – Mod DB A remnant nazi chapter has taken hold in castle Todesdrache in southern Germany. Colonel Müller, along with his henchmen, have successfully stolen the Holy Grail. Its supernatural properties have been the subject of debate for centuries. The OSA, not ready to take any chances, wants to send one of their best agents out to get it back. William J. Blazkowicz parachutes into the snowy woodlands just outside of the castle. Once more into the fray.