This NPC has been removed from the game. It was implemented by the GMs in the Suba Games version. Since the Almanac of Gods and Demons can be freely deleted, there is no need for this NPC.
Almanac Eater is a Merchant NPC.
This NPC was implemented manually by the GMs. Since the Almanac of Gods and Demons could not be deleted, you could have exchanged it to this NPC for a Transform Pill (Ghost), Transform Pill (Scarlet Spook), or a Pupu Coupon. This depended on how the GMs spawn the NPC; it took various forms. The chicken form was its default form. [1]