The unique affix, as of patch 2.6.9, prolongs the duration of Simulacrum indefinitely, but also adds a considerable Life over time cost, in addition to initial cost. This will not kill the Necromancer, but will instead leave them at a minimum of 1 Life. Note that this cost is not reduced by any forms of damage reduction.
In addition, this amulet will prevent Simulacrums from casting Skeletal Mage, but instead will allow them to cast Grim Scythe, along with all of its combinations and enhancements, including application of multiple Curses.
Another undocumented property is that this amulet allows Simulacrums to warp in to the Necromancer if they venture too far away.
Stats (Level 70)Edit
The spirits of the dead are never far. Search for them only a little, and they shall appear.