Here is some relatively UNKNOWN tips for farming items in D2/DR2 that nobody ever really talks about when asking best places to farm so and so items.
This is the actual most important information you need in order to farm actual stuff you want.
The game has loots right, -" well not all loots drop off every single enemy equally "
This tid bit of information is super important. because you then need to know what items you want and what enemies can even drop said items. go farm so and so or go farm so and so area. well that’s very general and basic.
Loot Types, some drop more weapons then armours and vice versa, or some drop more jewelry and runes and stuff vs weapons n armour etc etc etc.
So what enemy or boss has the LOWEST POOL OF LOOTS FOR SHEILDS< that still can drop the particular shield you want.
THIS IS THE TRUE TRICK TO FARMING IN THESE TYPES OF GAMES UNDERSTANDING THE ABOVE AND WHERE TO GO FOR THE LOOTS YOU WANT.
example Andarial / durial in NM / Hell have smaller sheild pools say 75 types then - mephisto / diablo / baal do say 150 types ( example numbers here not their actual pool ratio’s so you get the idea of what to look for ) means they wont drop as many types. alot less RNG to get what your looking for exactly.
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HoZ if your doing just bosses 1 andarial, 2 durial, 3 diablo, 4 mephisto, 5 baal in that order of item pool drop ratio chance to get a hoz. 1 is best 5 is lower chance. all can drop it, just their pool for shields.
Mephisto / Baal have a real large shield pools, which is why its not best spot to farm shields from vs some others. ( exceptions is baal has some very rare stuff others don’t drop so you have to go to select places for them regardless of it.)
to answer your question - andariel or durial NM / hell - whichever your toon can manage the easiest is where to go for a HoZ. better RNG chance table ratio.
So to sum it all up TLDR Style. Find what you want. find the Lowest monster level that can drop what you want, lowest item pool ratio of enemies that can drop what your looking for, and go farm those places. lower level faster easier to rinse repeat farm those spots.
The smaller the item pool they have the better the farm ratio, if it can drop what your looking for. This is your friendly pro tip of the day, enjoy.