Guardian's Eye

Guardian's Eye is an item used for spawning the boss Graw.

Other methods
Using Orange Spores or Yellow Spores on a Graw Altar will spawn a glowing Flye near it. This Flye will drop a Guardian's Eye when killed.

Spawning Graw
The Guardian's Eye's only use is for spawning Graw.

When used on a Graw Altar, Graw will spawn. This will consume the Guardian's Eye. If spawned on Peaceful difficulty, Graw will despawn immediately, so it is important to ensure that the world is not on Peaceful difficulty.

History
守护者之眼