Bestiary

The Bestiary is an in-game, filterable encyclopedia that shows information about enemies, critters, bosses, and NPCs. It can be found by opening your inventory, and clicking the book icon located to the right of your item disposal trash can. It includes basic statistics like health, damage, defense and knockback, but also advanced information like item drop rates. Furthermore, it displays a short description of the entity similar to item tooltips. Entries can be sorted by different statistics and can be filtered by certain locations, times, events, and other categories.

Initially, no information is available about any entity, and all individual enemy kills made prior to the 16 May 2020 update are reset to zero. When an enemy is killed (or a town NPC talked to), more information is revealed. At the bottom of the Bestiary is a bar that fills as the Bestiary is completed, allowing players to track their completion progress. For example, killing 1 Zombie unlocks appearance and spawning information, a few more kills gives its health, defense, and stats, a few more kills gives its drops without the chances, a few more kills fills in item drop chances and a fifth fills in the description.(can someone see if this apply to bosses)

A total of 50 kills is needed to complete information for a an enemy. Note that enemy with different variants (such as zombies) have separate trackers for each variant (50 arrow zombie kills, 50 gel zombies kill, etc...).

The Bestiary is tied to a world, not a character.

Filling in part of your Bestiary allows you to unlock the Zoologist NPC, and the Leather Whip item.

Tips

 * You need to fill out 10% of your Bestiary (52 entries) to have the Zoologist spawn.
 * You can buy a Leather Whip from the Zoologist for 15 after completing 15% of your Bestiary (80 entries).
 * After 25% (130 entries) you can buy a Mollusk Whistle for 20.
 * Once you complete the bestiary (520 entries) the Zoologist will sell the Universal Pylon.