Aegisheart of the Vow is a piece of Mortal Unique armor with no boss attached: it drops anywhere in Nightmare, most often from N9 up (rarer below that home difficulty, never above it), and nowhere else. Every copy is item level 100, and there 0.3% of what falls comes up Unique. It is built on Exalted Aegisheart Mail — step 6 of the Aegisheart Mail line, item level 80 and up.

It always rolls the same numbers: +80 Armor, +104 Ward, +436 Maximum Health, +110 Armor, +140 Ward, +658 Ward, +58% Healing Power and +58% Guard Power.

One Unique drop in 40 is a Mythical copy: the same item carrying 15–25% Mythical Energy that boosts every stat on it and can never be changed; the 15% floor is 10 times as common as the perfect 25%.

On top of that it carries Aegisheart of the Vow — Special healing +35%; +20 Healing Received.

“The knight who wore it never lost a companion. She lost everything else.”