Ironaya's Discarded Mantle

Source
This item drops from Auriaya in the 10-man version of Ulduar.

Trivia
The name of this item implies that Ironaya once dwelled in Ulduar, before she left for Uldaman and her mantle ended up in Auriaya's possession. It was eventually confirmed by World of Warcraft: Chronicle that both Ironaya and Archaedas came to Uldaman from Ulduar.