A Wraith can substitute all of its Attacks in close combat for a single Chill Grasp Attack. The Wraith makes a single Attack; if this Attack hits, then it will automatically wound. No armour saves are allowed against the Chill Grasp Attack.
Source: Warhammer Fantasy: 8th Edition
A Wraith can substitute all of its Attacks in close combat for a single Chill Grasp Attack. The Wraith makes a single Attack; if this Attack hits, then it will automatically wound. No armour saves are allowed against the Chill Grasp Attack.