Japanese name:

アケディア

Acedia is the "mage" of the group, as he is after the bearer of the eye of Aeon. He uses scrolls as his weapon. He is quickly killed by Kukuri, however one part of its head "scholastica" manages to flee, causing it to survive. However it is killed by Shiori afterwards. His two-parted head is cut down by Misuzu using Doujikiri and Scholastica dies at this time instead and Acedia is killed by Shiori afterward. Scholastica is actually Acedia's sister and they share a body. His Index's name is "Benedict of the Bookshelf". It is reveal by Shiori that Benedict and George are people in her family line. Shiori refers to him as her prototype when she kills him.

Voiced by: Uoshuyaki

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