User blog comment:Willbachbakal/(Item Concept) Spell-Based Sustain/@comment-24385282-20141115222330/@comment-1330314-20141115232425

Soul Sickle is an item that was implemented on the PBE for testing, likely intended to be a component to Essence Reaver. Here are its stats from the VPBE article:
 * Recipe: + 600g = 1400g
 * Stats: +20 attack damage, +10% life steal
 * UNIQUE PASSIVE: Restores between 1% and 6% of physical damage dealt by basic attacks as mana.

The item got pulled due to negative feedback, and in the above post I'm proposing an alternative. Apologies for the confusion this may have caused (though the Essence Reaver tab and the inclusion of Soul Sickle in its recipe should have been an indicator that I wasn't trying to remove ER).