What is diablo 3 gibbering gemstone?

Diablo 3 Gibbering Gemstone is a rare crafting material used to craft a staff called the Staff of Herding, which is required to enter Whimsyshire, a secret level in the game. To obtain the Gibbering Gemstone, players must go to the Caverns of Frost in the game's act three and defeat Chiltara, a rare monster that appears randomly in the caves. Chiltara has a small chance of dropping the Gibbering Gemstone as a loot and it may take several attempts to get it. Once obtained, the Gibbering Gemstone can be used to craft the Staff of Herding and gain access to Whimsyshire. Whimsyshire is a colorful and whimsical version of the game world where players can find unique enemies and monstrous loot drops. Overall, obtaining the Diablo 3 Gibbering Gemstone can be challenging, but it's worth the effort for players who want to experience the fun and craziness of the Whimsyshire secret level.