A Shadow of Doubt
When the dust had settled after the war, and the Allies began to dig among the ruined bunkers, hidden alcoves, and underground laboratories, they discovered things the Nazis had been working on that struck fear into their hearts.
Machines that gave off unique and arcane radiations, that melted skin or created windows into alternate worlds. Devices that brought the dead back to life as ruined monsters, or that seemed to do nothing, but caused bizarre things to happen around them nonetheless. As varied in size, power, and location as the results they imparted.
Many of these devices have been recovered, destroyed, or boxed away by the allied powers