Mirror of Wisdom's Light
From Age of Sigmar - Lexicanum
The Mirror of Wisdom's Light is a realmgate in the deep caverns of the Oakenbrow enclave known as Neith'y'Ghallich. [1a]
The mirror resembles a quiet, shimmering lake and forms a one-way street that brings light of Hysh to Chamon. It is not a full-fledged gateway between the realms as it was badly damaged in the Age of Chaos. It is more like a gate that has been left ajar. [1a]
The light that falls through the realmgate brings wisdom and life [1a]