Little Disciple

The Little Disciple is a boss item in Risk of Rain 2. While the holder sprints, they periodically shoot homing wisps at enemies, dealing 300% (+300% per stack) damage per wisp. More wisps are fired as the player's movement speed increases.

The wisps have a range of 40m and a proc coefficient of 1.

Math
The time in seconds between each fired wisp is determined by the formula