The Reaper's Cudgel (Golems of Amgarrak)

Acquisition

 * Origins/Awakening: Earn the Grim Reaper achievement by defeating the Harvester on Hard or Nightmare difficulty in the Golems of Amgarrak DLC.
 * Golems of Amgarrak: In one of the chests in the northernmost room in Amgarrak Thaig. Activating the switch to enter the correct dimension of the Fade triggers an excruciatingly difficult battle, especially for parties without a mage. Leaving the Fade will cause you to be attacked by 4 Elite Boss level Enraged Golems and 2 Elite level Golems; the resulting barrage of boulders is often enough to obliterate even the hardiest of parties in seconds without swift action.