Who Sent You? is awarded for killing 100 Assassins or Stygian Abductors in the Maw. At tier 3 of Eye of the Jailer, the Jailer starts spawning Assassins to harry the player. Defeat them (or other players' assassins...) to advance progress on this achievement.
- If the character has completed , the removal of the Eye mechanic makes it impossible to complete this achievement solo. The only way to continue this achievement at that point is by party syncing with a character who has not yet completed the quest.
- Patch 9.0.2 (2020-11-17): Added.