Bab 1403: The Rules 2

"Fourth, do not leave Yrniel. 

Since the Illusion is created through the combination of Yrniel's information and your subconscious, it has no knowledge of the world outside Yrniel, so the moment you step out of Yrniel's territory, you would 'escape' the scope of Yrniel, which would be considered as 'death', making you restart everything from the beginning again. So avoid the situations where you might be sent outside Yrniel as a Soldier to fight forces from the other world. 

Fifth, once again, is related to the Fourth Rule, 

Moving to the Dimensions connected to Yrniel is acceptable. Since those dimensions have been connected to Yrniel and are considered Yrniel's territory, Yrniel has all the information regarding it. 

I have noticed that you tend to use these Dimensions quite often, so I didn't want to take this liberty away from you.