Why does extracting legendary power from Halycon's Ascent fail?

Best Answer
I believe there is a bug with that specific item (Alcyon's ascent). I got two of them, and neither will transmute. They both have the same skill (When you use Archon, you mesmerize...). I'm trying to transmute on my mage, and this is obviously a mage-only power...
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How do you extract legendary power?
Extract Legendary Power The Legendary item is destroyed in the process. The legendary powers you extract with the Cube will always be added to your collection at their strongest power level. You can equip extracted Legendary powers by selecting the weapon, armor, or jewelry symbols on the Cube pane.What is archive of Tal Rasha?
Kanai's Cube powers are passive abilities extracted from various legendary and set items in Diablo III: Reaper of Souls. They are extracted via a recipe known as Archive of Tal Rasha.How to Extract Legendary Powers With Kanai's Cube - Diablo 3 - 2.3.0 PTR Preview
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