Another question here, guys. With the Infernal Machine, how many total keys do we need to ultimately craft the Hellfire Ring? I found my first one from Act 1, I know there are 2 more in Acts 2 and 3, and the plans in Act 4. Do we just need to collect all the keys once, then the portals are forever open?
Then open the portals and kill the bosses. You need 5 stack nv also.
The bosses have a chance to drop their Organ based on the MP level, mp1 = 10%, mp2 = 20%, etc, up to 100% on mp10.
Better hope you're not unlucky like me and end up with 9x spines and 8x fangs... and 0 eyes
Ouch. So this could "potentially" be a very drawn out process? I thought I was almost there when I found my first, and only, key. So, once we collect 3 of each key, then will we need to continue to find keys if we don't get each organ (in your case, for example)?
Think of the Infernal Machine as Uber Tristam in D2. In D2 you have to kill the 3 Uber versions of Baal, Diablo, and Mephisto. When you do one Charm will drop no matter how many people are there to kill it. You have to get keys to get to Uber Tristam so you have to do this many times to get the charm.
In D3 You have to farm for keys and organs to get machines and the ring. Even then often the ring will roll crap stats and so you will keep making rings and keep farming for keys and organs.