>>724862453
Shadows are 100% graceless creatures.
The Fingers create their own true human assassins as people who live in shadow their whole life so that they serve under their control, and after the Realm of Shadow was cut off the Two Fingers in the Lands Between adopted such methods, by hiring graceless people that lost their shadow as selected assassins named Confessors.
But Confessors had grace so they can have it back while Blaidd, or Jolan and Anna, have simply never received grace as they were born and lived in dark.
Light is the ability to control people