Essence of the Focusing Iris

Essence of the Focusing Iris is an Azerite essence obtained through the Mythic+ dungeon system after the start of Battle for Azeroth Season 3. This essence can only be used by DPS specializations.

Source

 * Rank 1 is learned from Converging Lens of the Focusing Iris, looted from the Challenger's Cache at the end of a successful level 4 or higher Mythic dungeon.
 * Rank 2 is learned from Magnifying Lens of the Focusing Iris, looted from the Challenger's Cache at the end of a successful level 7 or higher Mythic dungeon.
 * Rank 3 is learned from Stabilizing Lens of the Focusing Iris, created by combining 15 Focused Life Anima, which can be looted from your weekly Grand Challenger's Bounty in Boralus or Dazar'alor.
 * Players who have learned Rank 3 of Essence of the Focusing Iris, Anima of Life and Death, or Life-Binder's Invocation on any character have the option to purchase this item for 2,500 Echoes of Ny'alotha from MOTHER in the Chamber of Heart.
 * Rank 4 is learned from Biconcavic Lens of the Focusing Iris, an achievement reward from Battle for Azeroth Keystone Master: Season Three.