I was just in act II doing bounties in the oasis and came across the keywarden, I took him down and he dropped infernal machine plans. Doesnt the Act IV keywarden drop the plans and this guy drops a key??
If this is old news let me know, while not specifically key farming a key would have been welcomed, not the plans.
Keywardens actually also have a chance to drop a different key. I got the Key of Bones off the act 2 warden twice in a row and thought for sure it was bugged, till I looked it up and saw they had a small chance to drop a different key. Sure enough, I ran him again and got his normal key (Gluttony).
Also, if you learn the plans, I believe you should never have them drop again. (Both keys and plans are completely separate from the ones at level 60, if that is the source of the confusion).
If this is old news let me know, while not specifically key farming a key would have been welcomed, not the plans.
Drop rates of the keys are based on torment level, at t1 there is a 25% chance at a key and t6 has a 50% chance at a key.
Also, if you learn the plans, I believe you should never have them drop again. (Both keys and plans are completely separate from the ones at level 60, if that is the source of the confusion).
Cheers