If the only way inside the Vault was to be able to use a power system that nobody even remembered these days, this should mean that Darius' path was cut off here.
Ironically, it was practically guaranteed that behind at least one of these Vaults there should be information on Source Energy, yet without having it beforehand, one would be unable to enter.
Fortunately, Darius might once again be the only person on Faust who had a way to cheat out that knowledge.
Originally, he had planned to research Source Energy gently and cautiously in case it might conflict with his Supreme System or the spells he had learned which stemmed from Fallon.
However, since it was uncertain how long it would take him to reverse-engineer Source Energy without any information on it, he decided that he would take a risk for once and speed things up.
As such, he took out an empty book and focused.
