Eye Bone

Type	Pet summon
Use time	20 (Very fast)
Tooltip	Summons a living chest to store your items; 'It's looking into my soul.'
Rarity
Sell	2
Research	1 required
Buff	Chester
Buff tooltip	Otto von Chesterfield, Esquire
Use	https://terraria.wiki.gg/wiki/File:Item_2.wav
Chester opened	https://terraria.wiki.gg/wiki/File:Chester_open_0.wavhttps://terraria.wiki.gg/wiki/File:Chester_open_1.wav
Chester closed	https://terraria.wiki.gg/wiki/File:Chester_close_0.wavhttps://terraria.wiki.gg/wiki/File:Chester_close_1.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Eye Bone is a pet-summoning item which has a 33.33*1/3 (33.33%) chance to drop from Deerclops. When used, it summons a mobile Piggy Bank named Chester. Chester is essentially an upgrade to the Money Trough; not requiring to be re-summoned every time the player wants to access their Piggy Bank.

Piggy Bank inventory

accessed via:

Tips

Using a Void Bag with Chester will result in the player possessing 3 inventories simultaneously instead of the usual 1.
The Eye Bone and the Money Trough are both portable versions of the Piggy Bank, but the Eye Bone is arguably better because it can be placed in the pet slot instead of occupying inventory space.
- Unlike the Money Trough, Chester is permanently out and follows the player, allowing for quick and easy item and coin transfer by simply using the "Quick Stack to Nearby Chests" inventory function.

Trivia

Chester is the only pet in the game with a practical function.
The tooltip of the item is a reference to Wendy's examination quote for the Eye Bone in Don't Starve.
The tooltip of the buff is a reference to Wilson's examination quote for Chester in Don't Starve.