After he directly created a "Mind-Protection" and "Improved Illusion Protection" around himself.
After he finished creating these two, the system started to talk to him.
"The cave itself has a different and strong illusion of power.
This illusion forces the people who enter to see their past and if the people who see their past immerse themselves in the past too much the past will be going to reality and everything in the past will going to affect the real person.
There will be no alternate reality for the be the person who entered illusion (It is a trap)"
Brion just laughed and then he started thinking.