Place on the eye of another to deny them light in all its forms. Can also be used to receive the blessing of an equipped Great Rune, at the cost of all runes currently held.
In the realm of shadow, this artifice was employed by the priests of the Erdtree to intensify the fears of their flock to magnificent effect.
Fort of Reprimand: Enter the fort and turn to the left. Look for a hole on the floor and drop. The iris will be close by along with two enemies ambushing you.
Church District: Drain the water to access the lower section of the Church District. There will be two Ulcerated Tree Spirit in different areas. The one on the north will reward you the iris upon defeating it.