Kronorium

A book carried by Richtofen at all times. Holds infinite knowledge on the matters of past, present, future, as well as various artifacts of the multiverse. He had frequently consulted it, to see what future holds. It is presumed by some to be the way the viewers are able to see the LORE.

Season 2
The book is first seen in use by Richtofen after he had rescued Samantha's soul from the TV World, where he, in the routine check-up of the future, notices that the pages of the Kronorium had changed, due to other wrestlers taking too long dealing with the threat of Todd Howard. The distorion had become inevitable, and the multiverse was doomed. Yet, his plan was still in motion, despite the interference.

Later, concurrent with the final fight against Todd, Richtofen peered further into the future, to find that Kronorium gave quite the vague clues as to what the future holds. And an image of a Strange Man, with the The Focusing Stone in his hand. And in the matter of seconds, the future became quite clearer...

Season 3
The Kronorium held information on Chris-Chan, which Richtofen dared to look through. But the sheer insanity of the actions around him left Richtofen frustrated, so he opted to deal with it blind. For better, or for worse.

The actions predicted by Kronorium happened indeed... Most of them. Some wouldn't occur in the time of Chris and Black Battler. A few would occur much later.

As Richtofen left with the stone, so did the Book and Key. Their fate remaining unknown...

Season 5
Until Richtofen appeared again, free of the merge with the Oatmeal Cookie. The Kronorium led him to the corrupted Stone, and presumably was on his body the entire time, as was the Key. Though that wasn't to remain, as Richtofen was killed after his... inadequate wrestling abilities failed him for the last time. Yet, before he took his final breath, he left the mortal coil with these damning words:

Where is the book now? Who knows. Perhaps it is still on the corpse of the Doctor, its' pages changing again, as the future is split and rewritten once more. All will be known in due time... probably.