Which area you farm is decided by the area's monster level, not by the item —
the rule is the same for everything, so it lives on the
mechanics page.
NAMED TARGETS
Named monsters that can be farmed deliberately. The list spans all three difficulties;
each monster appears once, at its most rewarding one.
The figure is an estimated average kill count.
Duriel
hell · Lv 88~1 every 8,588 kills
Baal
hell · Lv 99~1 every 10,238 kills
Diablo
hell · Lv 94~1 every 10,538 kills
Mephisto
hell · Lv 87~1 every 11,308 kills
The Cow King
hell · Lv 81~1 every 12,484 kills
Andariel
hell · Lv 75~1 every 19,275 kills
BASE ITEM DROPS
expected per kill
This counts how often the plain Cutlass drops. A dropped base still passes
a quality roll before becoming this item.