Key to the Focusing Iris (reward)

Source
This item is a quest reward from The Key to the Focusing Iris.

The Key to the Focusing Iris allows players to summon Malygos in the 10-man Eye of Eternity only. The Heroic Key to the Focusing Iris (reward) is required to summon him in the 25-man version. This key is not required if you already have the heroic key.