Diamond Guardian Phoenix

 is a talisman in Total War: Warhammer II. It is unique to the High Elves and can only be gained through the Dilemma after the Invocation of Vaul (Vaul's Dilemma 4).

Description
This ornate diamond container houses a spark from the sacred flame at Asuryan's shrine; its bearers are granted resistance to magical attack.

Source
Obtained from a choice after invocating a rite as High Elves.