diablo 3 best way to farm forgotten souls

Going to copy and paste a lengthy post I made in another tips thread awhile back. The absolute final tier of things to do is using Kunais Cube to empower your gear by spending highly upgraded legendary gems.

Also, don't forget to spend your Blood Gems at Kadala and look into the crafting you can do with Kunai's Cube (both of these are fairly minor, but still useful if you're missing a specific item). You can have 3 Leg gems equipped (one in each piece of jewelry) and you upgrade them by doing higher and higher greater rift levels. Once you're past the point where you rarely find any gear upgrades it's all about grinding Paragon levels and Legendary Gems. The reward for doing this is a very unique and generally very powerful amulet (buy the recipe from the vendor in act 2 camp), so it's also something that's worth spending an hour or two doing at some point anyways. You can open these portals by going to Tristram and manually attacking the door 'northeast' in town (first or second if you enter town from where you start the game) then using the machine inside. Killing these gives you infernal machines that will open portals to the 'uber bosses'. Doing these usually also involves killing the Keywardens (there's one in each of the first four acts, marked by a key on the map). You probably won't be able to do them all right away though. If you're playing a seasonal character it's a good idea to check out your journey goals once you hit 70, as doing them will reward you with a good starter set.

So you basically end up switching back and forth between normals and greaters.

You have to do normal rifts to get greater rift keys, which is where the biggest rewards are. Doing bounties early on is also nice since once you're 70 the name of the game is rifts and you haven't already burned out on grinding them. The best way to level up to max level (without any outside help) is to do bounties (remember to do all the bounties in a single act to receive the big reward). As soon as you're able you should start playing in adventure mode instead of campaign.

Diablo 3 best way to farm forgotten souls