Chroma Key

A cylinder-shapred object made from massive stone, varying from the region it is found in. Regardless of the variation, the object has dimly-lit symbols on each side written in Icasohedran, a dead language. 

To date, two such objects are known to exist:

Location	Description
Daggerborne Ruins	The object was used in order to remove a magically blocking wall, placed in a hallway to hinder further movement inside. It is not known whether this function was the original or later used to make it this way.
Cassius Ashglade	It was carried with him while investigating the Wardens, it is said the object variation came from Avalon.