Tectonic Key

The  is a Hardmode key that can be used to open Tectonic Chests and Blazing Lock Boxes obtained in the Underworld Domain.

The key also has another purpose. It can be used to unlock the Tectonic Cage. Using the key on the cage will release Paraffin.

The item is dropped from Overloaders which can be summoned by using Worm Wood.