Eonomicon

General Information
The 'Read' tool, commonly referred to as the 'Eonomicon' (an unofficial name) is a book that with a left-click, gives you one knowledge point (visible on the bottom-left). The cooldown for clicking is four seconds.

Uses
As of yet, there is only one use for the Eonomicon, which to gain or lose knowledge points. This knowledge (when positive) can then be used to read various signs across the map for information. It is rumored that in future updates, the Eonomicon will be used for various spells. Gavineo has stated that Knowledge will allow you to become an angel or a demon. To become an Angel, you must achieve 75,000 positive knowledge, giving you a yellow halo above your head. Becoming a Demon requires an Amulet of Depth activated, in which you will then gain negative knowledge for each click instead of positive. It is rumored you can achieve wings at 800,000 or -800,000 knowledge, however this has not been confirmed.

Proof of a player above 800,000 without wings.

Trivia

 * A model of the Eonomicon was originally found at the height of the wall on Floor 1, but on 7/16/2019 it was moved down below the map.
 * This is one of two items in the game you are given by default on most floors; the other being the Lantern.