| This article is about the armor set. For other uses, see Immortal.
The Immortal Set was a set of armor owned and worn by members of the Immortals, an elite army unit of the Achaemenid Empire.
During the 5th century BCE, the Cult of Kosmos was able to obtain one such set, distributing it to the members of the Worshippers of the Bloodline branch. The misthios Kassandra was able to obtain the set pieces while hunting down each member of the branch.