Here's the list of items/locations:
You can craft the magical staff (60,000 gold), you just need the proper pieces and the plans. Keep in mind that they don't always appear the first time through. If you go to the correct location and nothing is there, your best bet is to completely exit the game, load it back up, pick a NEW quest (in the same vicinity), then go to the spot where they're located.
The Normal version of the plans are dropped randomly by Izual on Act 4: Prime Evil. Head to The Crystal Colonnade and find your way to the Gateway to the Silver Spire. Next you will enter the Silver Spire Level 1, and finally encounter Izual on The Great Span.
Note: The plans may not drop for all players in the party, just keep trying until you get the drop (it may even be necessary to take the fight 30+ times).
- Black mushroom (Cathedral Level 1, Act 1)
- Shinbone (Leoric’s Manor, Act 1)
- Liquid Rainbow (Mysterious Cave in Mysterious Chest map, Act 2)
- Wirts Bell (One of the selling merchant in the city, Act 2)
- Gibbering Gemstone (Chiltara, Caverns of Frost, Act 3)
- Plans (Izual, Act 4)
Also, the cow portal is in old trist
Here's some mini guides for each part:
Start a new game at Act I, Quest 3: A Shattered Crown.
Take the waypoint to the Cathedral Garden, then enter Leoric’s Passage.
Head up the stairs to Level 1 of the Cathedral and search every room until you find Black Mushrooms.
Click on the Black Mushrooms and loot your ‘shroom.
Start a new game at Act I, Quest 9: The Imprisoned Angel – Part 2: The Cursed Hold.
Take the waypoint to Leoric’s Manor.
Enter Leoric’s Manor – go up the stairs, down the stairs, then enter the first room on the left and look for Burnt Logs in the fireplace at the far wall.
If there are no burnt logs, then exit and retry. If the burnt logs are there, then click on them and loot Leoric’s Shinbone.
Wirt’s Bell is a very easy item to acquire – provided you have the gold.
Start a new game at Act II, Quest 2: The Road to Alcarnus.
Head north and port into the Caldeum Bazaar.
Proceed NW and look for “Squirt the Peddler”. She’s over by the cart near the fountain.
Click on her Miscellaneous tab and buy Wirt’s Bell for 100K gold. This step can be done at anytime if you don’t have enough gold yet.
Start a new game at Act II, Quest 6: Betrayer of the Horadrim – Part 2: The Forgotten Ruins
Take the waypoint to Path to the Oasis.
Head east – keeping to the south – and look for the first path that leads to a small hut where Zaven the Alchemist is being attacked by some Deathly Haunts. If Zaven is not there – exit out and retry.
If the event is happening…kill the phantoms and then Zaven will talk to you. He then opens an entrance to the Mysterious Cave.
Enter the Mysterious Cave and look for the Mysterious Chest. Open the chest and loot the Liquid Rainbow.
This item is by far the hardest mat to acquire. For a more detailed walkthrough, please see this in-depth guide to obtaining the Gibbering Gemstone.
Start a new game at Act III, Quest 6: Siegebreaker.
Take the waypoint to Korsikk Bridge.
Head east into the Fields of Slaughter and look for the Caverns of Frost. If you see Icefall Caves, exit out and retry.
If the Caverns of Frost event is spawned, enter the cave, head down to level 2 and look for Chiltara. If Chiltara is not spawned, then exit out and retry.
If you get lucky and find Chiltara, then kill her and take her gemstone.
Plan: Staff of Herding
The recipe for the staff is a random drop from Izual. I don’t know the drop rate, but I got mine after the 6th kill.
Start a new game at Act IV, Quest 4: Prime Evil.
Take the waypoint to the Crystal Colonnade.
Enter the Gateway to the Silver Spire and make your way to the Great Span.
Kill Izual and loot the plan. If he doesn’t drop it, then exit out and retry as needed.
Crafting the Staff of Herding
Gather up all your mats and your recipe, then go see the Blacksmith.
Right click on the recipe to teach him the plan.
Select the Staff of Herding in the list of weapons and fork over 50K for his troubles.
Getting to Whimsyshire
In Act I, take the Old Ruins waypoint then head west along Old Tristram Road.
Look for the skeleton of a cow right near a glowing crevasse. Provided the Staff of Herding is in your inventory, the cow’s ghost will appear and talk to you.
The ghost of the Cow King will chat with you for a bit, then unlock the gateway to Whimsyshire.
Head in and start killin’!