This is a drop from the final boss of Einherjar. Once youve obtained the key items for clearing each of the 9 wings of Einherjar you gain access to the 10th and final room where you will be tasked with bringing down Odin himself.
This looks like itd be an excellent piece for a damage reduction setup, especially considering it reduces ALL damage. While such a setup wouldnt work for xp, merit, anything where the mob dies really fast anyways, itd be excellent when something with a lot of HP and damaging moves needs to be tanked. What I must wonder though is exactly WHERE and HOW this piece is obtained. Any ideas on this?