The unique affix affects all Curse effects (Decrepify, Leech and Frailty) as long as it is applied as a result of an active cast. It will pull all enemies affected by the cast, but not yet affected by any Curses, to the cursor location (counts as Knockback).
Stats (Level 70)
"Let fear strike my enemies in the moment of their greatest weakness. Let their suffering embalm them as death comes." — Passage from the Prayer of Briggs