Activated Items

Books and Scrolls

Books and Scrolls are the Librarian-related items that can be brought from him. They can give give you temporary buffs, but when you activate one of them, they all go for cooldown, which depends on the used item.

Item	Buff/Debuff	Effect	Duration/Cooldown
Monolith Tome	/	Temporarily increases defense by 12, reduces all damage by 50%	40 sec. / 1 min. 40 sec.
'Communication with your servants'	/	Temporarily increases minion damage and knockback by 16%	1 min. / 2 min.
Dead Sea Scroll	Random /	Gives a random buff	1 min. / 1 min. 30 sec.

Potions

Potion	Buff	Effect	Duration	Craft
Purifying Potion		Gives temporary immunity to most debuffs	1 min.	1 + 2 at
Anxiety Potion		Temporarily increases damage by 10% when player moves Decreases when standing still	2 min.	1 + 1 + 1 at

Pets

Buff	Pet	Item	Source
	Jack Frost	Life Stone	By melting ice cube at Stranded Ship with
	Lil Witness	Enchanted Horn

Boss Summons

Item	Conditions	Boss	Hardmode	Craft
Shadow Locket	Can be used only at night			3 + 1 at /
Snow Beacon	Can be used in the Snow Biome			5 at

Other

Item	Buff/Debuff	Effect	Duration/Cooldown	Source
Safe Bottle	/	Allows you to collect hearts in the bottle and use them later to restore health	/ Depends on amount of hearts
Phosphorous Lamp		Can produce light while carried in the inventory	Charging during daytime	Chest at the Stranded ship
/ Molten/Cooled Ring	/	Creates a ring of fire around you You must charge it near the lava for later use / You need to charge it near lava to use again	15 min. /
'Disregarding for Dummies'		Use to prevent the drop of elements from slain monsters Use again to cancel the effect		Sold by
Moon Token		Changes the phases of the Moon		3 + 3 + 600 at /
Vamplified Ring	/	Temporarily allows a melee weapons to absorb enemies health	3 min. / 5 min. 30 sec.	10 + 10 + 10 + 300 + 300 + 3 at /