Guide to Critter Companionship

The Guide To Critter Companionship is a tool that prevents players attacks from harming critters. It is not equippable and will, as its tooltip states, work by simply being present in the character's inventory. It is purchased from the Zoologist for.

Tips

 * This item is especially useful when farming Truffle Worms, which in turn are used to summon Duke Fishron.
 * It is also very helpful to avoid the player from inadvertently killing Ladybugs, an action which temporarily damages the player's Luck.
 * It can be used to avoid accidentally killing Prismatic Lacewings, which summons the Empress of Light when killed.

Trivia

 * The symbol on the book appears to be a Bunny.