Hyrule Compendium

The Hyrule Compendium is a Sheikah Slate function in.

Location and Uses
When Link obtains the Sheikah Slate, some of its data, including the Hyrule Compendium, is damaged. In order to repair it, he must progress through the "Slated for Upgrades" side quest at the Hateno Ancient Tech Lab.

The Hyrule Compendium compiles pictures and information of every creature, monster, Material, piece of equipment, and treasure. In order to register an entry, Link must take a picture of the subject with the Camera Rune. Alternatively, once the side quest "Sunshroom Sensing" is completed, Link can purchase pictures from Symin at 100 Rupees per picture (500 for an Elite Enemy, or Boss, picture). These pictures are random, but are guaranteed to be of objects not yet registered. Entries saved in the Compendium can be detected using the Sheikah Sensor +.

Once Link completes the Hyrule Compendium, he can obtain the Classified Envelope from Symin.