Pyramid

The "Pyramid" is a device presumably constructed by 935 to hold Samantha Maxis in cryogenic sleep so that she could be used to control the zombies. It is unknown how the device grants Samantha the power of controlling the zombies.

The pyramid's base is covered in markings similar to what can be found across the temple on Shangri-la.

When the pyramid is opened during the Richtofens Grand Scheme easter egg, you can see Samantha is holding her teddy bear. This explains why the teddy has played such a large role in the zombies canon.