Eye of the Eaglecrest Golem
The Eye of the Eaglecrest Golem is a Pre-Hardmode furniture item dropped by the Eaglecrest Golem. It is also sold by the Wayfarer after the Eaglecrest Golem has been defeated. It is used in the creation of the Ancient Sigil.
After defeating Moon Lord, the Eye will begin to glow and its tooltip will change to "Place down and encase the eye with the stones of its origins, and its true power will present itself". Placing down the Eye will show a projection of where the correct blocks should be placed. Placing down either Gathic Stone or Gathic Gladestone around the Eye will begin transforming them into Energized Gathic Stone. Once the structure is complete and all of the stones have been transformed, it will be struck by lightning, removing the structure and dropping the Ancient Sigil.
Gallery
Placed Eye showing the projection
Partially complete structure with some of the stones energized