For the addition, see w:c:futurediary:Diary Holders and Diary Holders/versions.

A Diary Holder is a person capable of predicting the future via his or her Diary. Primarily, there are twelve Diary Holders who are candidates for Deus Ex Machina's survival game (Thirteen in the game, The 13th Diary Holder). However, it is possible to create Apprentices where each individual receives a future diary as well.