Nature's eye

Is an item dropped by the Glare, Or found in mob spawner dungeon chests (13% chance, Max 2)

Looks
Its a circular item with a yellowish-white degradation and a small brown pupile on it that moves constantly. has some green leaves on it.

Use and crafting
The use is similar to the ender eye, except it detects underground structures, big caves and mob spawners instead of the stronghold.

It can be crafted into a Nature Seeker, a defensive-farming block, simply by making an X with the eyes and filling the rest with mossy cobblestone