You decide to go to the misterious prehistory, in central Europe.
Nomadic cultures have always fascinated you, and what's better than checking that historical period very close and personal? On your own flesh? You liked the idea a lot.
From all the mysterious and amazing cultures of the period, you chose Aurignacians, for their intriguing culture and their advanced methods of survival. They thrived around 42.000 years ago, and imagining going so far in time is enough to send you chills and hype your mind.
You open the book and prepare the spell, but you notice a kind of hidden writings on the bottom of the page. "Before traveling to a new destination and time, you can modify yourself to best suit your destination, by putting your finger in these scripts". A part of the page has a circle of runes and weird symbols.
Apparently, you can change your body and language to best suit where and when you'll travel, all you have to do is touch the runes while you're doing the spell and think about the changes you want to be done.
Thinking about the dangers and challenges you might come across, but don't wanting to change too much about yourself to be unrecognizable, you start to doubt.