Demon Skin Armor

It is listed as a magic item known as "demon skin" it is an item from "Descent into the Lost Caverns of Tsojcanth" which I am pretty sure I had. That module was later included in Quests from the Infinite Staircase. The Item page now directs you to market place to purchase the Decent book. Since the book was moved to be part of Quests, you are redirected to purchase Quests. However, Quests doesn't seem to include the item and so you just end up back at the please purchase the Decent book page when you attempt to look at the item.

Any way we can get this fixed? Either by adding it in or throwing it in drops or just as an item. I don't want to keep creating it as a homebrew.

Thanks