Mystery

Mystery (神秘) is a sliver of power of many different types that comes from the Root. It is the source of all supernatural phenomena such as Magecraft or ESP, and beings such as True Ancestors, Servants, Spiritual Bodies, as well as Phantasmal Species are beings formed entirely of Mystery. If multiple people attempt to use the same type of Mystery, such as in the case where the general public becomes aware of Magecraft, the Mystery itself will weaken and die out.undefined

If two different types of Mysteries collide with one another, the stronger Mystery will overwhelm the weaker one.undefined

Merlin reveals in 'Garden of Avalon' that planets change their laws of physics according to the kinds of creatures living on its surface, and because mankind became the dominant species on Earth, the Mystery of the gods slowly disappeared, and the Age of the Gods ended entirely with Solomon's death. Uniquely, however, Britain retains some of the gods' Mystery due to being the "navel of the Earth" that connects the World to the Reverse Side of the World.

Certain items that have a long history and age can also show signs of Mystery, as in the case of the century-year old katana that the Ryougi possess, Kanesada Kuji. If they are damaged, however, they will lose all the Mystery they have accumulated.

It is also possible for a human's body to reach the level of a Mystery, such as with Shiki Ryougi.undefined

Although a more powerful Mystery will erase a weaker one, this does not necessarily mean that the user of the stronger Mystery will be stronger than his opponent. For example, for Heroic Spirits, it is usually the case that a Heroic Spirit of the Age of the Gods will have a higher Mystery, but a Heroic Spirit of the Age of Man will have higher fame. However, there are exceptions with this rule, such as with Achilles.