To defeat the Queen Geist sounds simple. Man a turret, while avoiding her Veil bomb attacks, and shoot the soft part underneath her face, or her face itself, until she falls down. Then shoot one of the eggsacks out. After the eggsack is gone, she vanishes into the Veil, and either Soldier, or suicide Geists come. Both types of Geist are visible without entering the Veil; the Warrior Geists will run towards the turret and slash at BJ while the suicide Geists appear in the air and fly straight towards the turret. After B.J. destroys all the attacking Geists, the Queen Geist comes back to the battle, and smashes the turret B.J. is at, forcing him to move through some strange Veil explosions she causes to another flak turret to repeat the process until her 4 eggsacks are gone. Note, though, that once B.J. mans a turret, he cannot move from it until the Queen Geist destroys it. When he first mans it, she will come toward him, and if she is not shot down quickly enough, she will slice B.J., killing him instantly.After the fight on the castle, the Queen Geist reappears on the road out. She is much weaker, and easier to defeat. Keep moving and shooting her head. When she is close enough, she will try to rise and fall on you, showing her vulnerable spot under the head. However you must note that you will have to move to the blocked entrance of the castle where if you reach a certain spot she will teleport behind you. After that you will have to move with backsteps again to your objective. Once again she will teleport in front of the door which is your objective blocking your way. A good strategy is to use Empower in order to deal to her more damage; with the Leichenfaust 44, this task is much faster to achieve. After enough damage is done, she will fall down near the end, and B.J. must run up, place dynamite on her to kill her. She is finally defeated after that. See: Wolfenstein (2009)