Who is doing Season 4? What builds are you going for?

[Devile]

That was my idea of multiboxing when I first started ... farm with 4 chars to give all the good stuff to my main char. Didn't take much time to figure out that I didn't like that approach but instead making all 4 chars better instead of just 1? Why? Cause its far more effective and fun also. Sure u can always pimp 1 char to the max and use it to carry the rest, but there's so much that char can do in terms of DPS and your party survivability. Eventually u notice things are too slow and very inefficient. U can't go higher in difficulty and u cant go any faster either, which hurts your progress. Best approach IMO, is try to improve ALL your chars instead of just 1. That makes your whole party do more damage and be tougher. That doesn't mean u can prioritize your main, but in general, if I'm missing 1 item from my party build and I get an Ancient drop, I give it to the char missing that item and not my main. Will benefit my party a lot more, than having 20-30% more dps on 1 single char.

Cube? Depends on builds, but usually whatever I don't need or is non ancient, goes there, asuming it's needed. U can also give set items u dont have to another char in order to reforge it on the cube and get that missing set part.

I to rift for materials and keys. Greater Rifts for experience. U can get items from both. And blood shards, sure, a lot of gambling from back to back greater rifts.