How do you reverse a transmorgification?

I don't want my Glorenzelg to look like what it does, so how do I untransmog it?

Quote:

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Players can also make use of a 'Scroll of Purification', a cursed parchment that holds Void magic and devours all Ethereal technology from the transmogrified item, leaving only the original appearance.

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This in the release of transmog post.

5 coins on store

Damn, what a waste, should just create a gold dump in-game. I wish it was obtainable in-game via bosses like the disception