This is obtained from [Kronk's Grab Bag], a quest reward from  Banish More Demons. You also have a chance to get a [Darkrune].
Patches and Hotfixes Edit
Patch 2.2.0 (25-Sep-2007): This was added to the game as a replacement for [Apexis Shard], [Charged Crystal Focus] and [Depleted Crystal Focus] from [Kronk's Grab Bag].
5 of these can be turned into a [Darkrune].
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