Star Shard

Synopsis
The Star Shard is a relic that is stored in a hidden vault within Mycelium Palace in Mycorrhiza, locked behind the Thousand Year Door. It was bequeathed to the founders of Mycorrhiza by the astral spirit Heartsong, who said that it offered protection from the corrupting power of the Earthstar within the Underdark.

The Thousand Year Door
The Star Shard is locked in a vault behind a magically-sealed door called the Thousand Year Door. The Thousand Year Door can only be opened using the Chaos Core, which must first be charged with the power of the four elements - a task only achievable by a conduit.