The diary was written by a person called Jakery. He was a rank 5 mage and the person in charge of the whole operation for the order in the magical kingdom of Gilthar. He was an extremely powerful mage even amongst the rank fives.
The beginning of the diary was filled with his daily occurrence and was not very interesting to Rein or Lapis. But Luna still found it interesting as according to her, these things gave her a good idea about how the order of Ramna functioned so many years before.
But the part Rein was actually interested in appeared almost at the end of the diary. There Jakery mentioned how he had gotten a secret news that the magus opposing them had became aware of this location and was planning to take offensive action. So immediately he decided to leave this base. That was also the reason why he had hidden most of the important supplies in this secret room.
