[Shikimori Kazuki]

Originally Posted by Village Idiot

Spoiler:

Tracing is the power granted to Shirou through his Reality Marble.

Basically, it allows him to create a mirror copy of anything he has seen at least once, though the copy will be reduced one rank in ability. (hence the significance of Shirou learning the elements/blueprint of objects)

Not just the object is copied, but the memories of the object is copied as well. Basically, it allows Shirou to automatically become an expert with the object (though IIRC, his skill with it is automatically reduced one rank as well), as well as being able to see flashes of the memory of the object.

Spoiler:

To begin with, how does he has Reality marble, what is it? is it like a world of himself or something? oh btw for Excalibur, i thought it was one sword hm...and theres Caliburn, sorta confuse, do u guys have a site where i can check out the myth and stories behind it perhaps? thanks in advance