The item will be account bound as soon as it drops. There is also a bounty quest to kill Chiltara, which may make finding the Huntress easier. Gemstone drop rate is approximately 5%, but as of patch 2.0. 5 the spawnrate of Chiltara has been increased.
She only spawns in level 2 of Caverns of Frost which are not guaranteed to spawn. Chiltara herself is also not guaranteed to spawn, and does not guarantee a drop of the Gibbering Gemstone.
Is it possible withe current seasons altar of rites that my pet has "salvaged" the gibbering gemstone or is it not a salvagable item? Pet cannot salvage it, you just haven't gotten it yet.
The Black Mushroom is an item used to craft the Staff of Herding to gain access to Whimsyshire. It can be found on Level 1 in the Cathedral (Normal difficulty).
As for the recipe, you'll need to kill Izual in Act 4 to get your hands on it, although you might have to do this a few times as it's not a guaranteed drop. When you've got the recipe and all the ingredients you need, head to Haedrig the Blacksmith, teach him the recipe, then craft the Staff of Herding.
Put the Staff of Herding in your inventory (it's not necessary to equip it). Note that the staff is permanent and it is not consumed; in fact, you can replay the Whimsyshire level as many times as you like.
As of version 2.0, any version of the Staff of Herding will grant the player access to Whimsyshire on any difficulty, so it is no longer necessary nor possible to upgrade the staff. It has an Item Level of 1, and requires character level 1 to be used.
The Caverns of Frost are, as the name suggests, caverns filled with frost. Use the Bridge of Korsikk waypoint to get to the Fields of Slaughter in Act III of Diablo III, the area always spawns a single cavern. Most of the time the area spawns the Icefall Caves, however 30% of the time, the Caverns of Frost will appear.
Whimsyshire is a Secret Level, or secret land, in Diablo 3. When you enter the Secret Level of Whimsyshire a Feat of Strength along with a Banner and Sigil are unlocked. You can run the Whimsyshire level as many times as you want and you will get the In The Land Of Killer Unicorns achievement for finding it.
Leoric's Shinbone is a miscellaneous crafting material in Diablo III, it is used to construct the Staff of Herding which is necessary to access Whimsyshire. It can sometimes be found in the fireplace of Leoric's Manor in Act I. The fireplace is located at the end of a hall on the right side the manor in the entry area.
Fields of Slaughter is a zone between The Bridge of Korsikk and Rakkis Crossing in Act III of Diablo III.
What difficulty level are you farming it on? Keep in mind that a while back, Blizz made all mats, including Gibbering Gemstone, a higher droprate on higher torment levels. So if you are speed running normal, or even low torments for it, you should just instead do T16 runs for it.
Wirt's Bell is a miscellaneous crafting material in Diablo III, it is used to construct the Staff of Herding which is necessary to access Whimsyshire. It has an Item Level of 1 and requires a character level of 1.
The Rainbow Goblin is a rare variant of the Treasure Goblin in Diablo III, introduced patch 2.1. 0. They never appear in Nephalem Rifts. They do not have any special drop, but open a portal to Whimsydale when killed.
Can be found in Adventure Mode and is made easier to gather when the Bounty in Dahlgur Oasis is for clearing the Mysterious Cave Level 2 of all enemies.
Once inside of Leoric's Manor locate the northern room (use your in-game map to check your orientation); it is the room to the "top-right" of the stairs leading to the Coven's meeting. If the item is in the room, you will see wood in the room's fireplace. Just click on it and you will get Leoric's Shinbone.
Entering Whimsyshire
When you reach the waypoint, follow the path in the image above. At the quest sign, you will find the Ghost of the Cow King. Speak with him and he will transform the red chasm next to him into a portal to Whimsyshire.
Sir William is a Super-unique monster that corresponds to Princess Lilian from Whimsydale. The spawn rate for Sir William in Whismyshire is also at around 0.5 - 1%. You have to remember, he will only spawn in Whimsyshire, while Lilian can only be found in Whimsydale.
There is no achievement for entering or beating it, but there is a chance of obtaining two weapon transmogs (sward and dagger) and Cosmic Wings.
The Horadric Hamburger
Odds for Ancient are about 1:10 (it's 30% stronger) and Primal Ancient about 1:300 (it always has perfect rolls). Odds for Ancient are about 1:10 (it's 30% stronger) and Primal Ancient about 1:300 (it always has perfect rolls).
I think the drop rate is somewhere between 2% and 5% (without MF). Here is an important Note: The "Plan: Staff of Herding" is a legendary item and thus it is affected by Magic Find. If you have a very high MF > 300 % you will get the Plan very often.
The Plans: Staff of Herding are a required ingredient to craft the Staff of Herding, which is used to gain access to Whimsyshire. The plans are dropped randomly by Izual on Act 4: Prime Evil (on any difficulty level). Head to The Crystal Colonnade and find your way to the Gateway to the Silver Spire.