Hey Jennifer
I imagined a secret magic book written in old Bulgarian and placed under the protection of Viktor Krum called KRUM`S GUIDE TO VICTORY

Those who like the Harry Potter series know that Viktor Krum is a fictional character created by JKRowling.According to the book Harry Potter and the Goblet of Fire / Viktor
is a wizard from my native Bulgaria (heres his name in Bulgarian Виктор Крум) and having in mind he was born in 1976 he must be my age.

I believe Rowling created the name after the real Bulgarian ruler called Khan Krum the Fearsome famous for creating the first written laws in Bulgaria and for defeating Byzantine Emperor Nikephoros I in 811 AD. In 811, Nikephoros invaded Bulgaria, defeated Krum twice, and sacked the Bulgarian capital Pliska.While Nikephoros I and his army pillaged and plundered the Bulgarian capital, Krum mobilized as many soldiers as possible, giving weapons even to peasants and women. This army was assembled in the mountain passes to intercept the Byzantines as they returned to Constantinople. At dawn on July 26, the Bulgarians managed to trap the retreating Nikephoros in the Vărbica pass. The Byzantine army was wiped out in the ensuing battle and Nikephoros was killed
It is said that after his victory Khan Krum had the Emperor's skull lined with silver and used it as a drinking cup. I`m not sure about the drinking cup, but Nikephoros was one of the few emperors who were killed in battle.

https://en.wikipedia.org/wiki/Krum

So Viktor Krum could mean Krum the Victorious, a man who defeats his enemy or opponent in a battle, game, or other competition.
And KRUM`S GUIDE TO VICTORY should contain the legacy of Khan Krum the Fearsome, the knowledge to turn defeat into victory.