A good place to farm is in The Shrine of Storms. Equip your Ring of Avarice the Viscous Compound Long Bow +5, arrows, and the 4-2 Archstone. Go down the hall passing Graverobber Blige and stand at the edge of the floor. Fire down at the reaper. Then, fall off of the cliff to respawn and get your bloodstain. Repeat as desired.