King Otto's Monster or The Monstrosity is an enemy in Chapter 8 and the final boss of Wolfenstein: The Old Blood.
The Monstrosity was a creature created long ago by the alchemists of King Otto as a weapon of war from the assumed parchments of Da'at Yichud ancient genetic technology. When Otto saw the destruction that the monster could cause, he decided it was an abomination. He burned Wulfburg and entombed the monster alive, leaving it undisturbed for centuries.
In 1946, the S.S. Paranormal Division arrived in Wulfburg to discover the secret of King Otto, where they began digging for clues within the cemetery. Far below Wulfburg, the Nazis triggered dynamite and caused an earthquake that destroyed much of Wulfburg, killing and resurrecting civilians and Nazis alike with a strange gas. B. J. Blazkowicz reached the source of the miasma in the Monster's lair, but was captured by Helga, who finally freed the Monstrosity. Much to Helga's affirmation and Schreiner's disbelief, the monster initially submitted to Helga's control but soon grew agitated, mortally wounding Helga and tearing Schreiner in half. Blazkowicz freed himself and defeated the Monster, ending the secret of King Otto forever.
- To kill it, it is recommended that you shoot at its mouth for maximum damage.
- It is blind, and only attacks if it hears sounds. Try to stay silent if you're not attacking it.
- The upstairs floor of the arena has all the supplies needed for this fight. Even if you run out of ammo, more will drop in for you to restock.
- Use grenades to distract the monster.
- Use the Kampfpistole to deliver the most damage.
- As the fight wears on, Nazi soldiers, and later shamblers, will pour into the arena from the upper floor. Keep a distance from soldiers, as the monster will attack them as well. Most of them will be instantly killed, while a few will take enough damage to become shamblers. Again, use grenades to also deal with the shamblers, as gunfire will attract the monster.
- When the Shamblers start to appear, use the Handgun with the suppressor attached to stealthily take them out without alerting the monster.
- Don't get close to Shamblers, because the monster also responds to their melee attack, and since they're closer to you, you'll also get damaged when it attacks.
- The Monstrosity is referred to as "golem" in the game files. A golem is an anthropomorphic being in Jewish folklore, originally cast as an inanimate servant conjured by transcendent rabbinical scholars. Similarly, in-game lore reveals that the Monstrosity is the product of re-appropriated Da'at Yichud science.