Hey! with the 1.0.3 Whimsyshire will drop just act3/4 items and maybe it will worth farming, so I looked into a way to stack 5 NV and I found this the fastest and easiest for me
The good point of this against the Watchtower on Northern Highlands is that this one is 100% here and you'll find at the very least 4-5 packs of rares
1. Waypoint to the Festering Woods:
2. Now we'll search arround the map for some pack of rares while looking for the 2 crypts: Warrior's Rest and Crypt of the Ancients
3. When you find one of them, go inside, kill the elite and go outside again
4. Search for the other crypt, usually it's on the opposite side of the map, i'll draw a map below, on the road you may find another pack of elites
5. Find and join the last crypt, kill the elite, then go outside again
6. At this point you'll have 3-4 stacks and you've 2 ways to get the 5th.
a) Search trought the map for more rares, usually there's at least 1-2
b) If the whole map is clear, go for the event on the south of the map, this pack will be a little harder, they've more damage and hp than usual but still easy killable, on this run i got an Invulnerable minions+Fast so I had to kite them to kill and lost some time, but that's just bad luck :P
7. On the south of the map you'll find a yellow mark for the event, you just have to click the stone, kill some thrash then the elite will come
Now you'll have 5 stacks and you're ready to go to whimsyshire, butcher or whatever you want on Act1, as you can see I just expent some minutes on the last pack cause it was a little harder with his invul+fast, usually you can stack up to 5 in 5 minutes really easy, the map is always almost the same, but anyway theres one of them:
The most of you may know this place but I hope some1 find it useful, I'll make another guide with the best spots to stack NV for fasts Siegebreaker runs soon (: Cya!