Many players have recently complained about extremely low drop-rates for the Gibbering Gemstone, which was hard enough to get even when it used to be a 100% drop rate. The gemstone is a required component for the Staff of Herding, and it drops from a rare spawn mob within a rare spawn cave, which means it’s already tough to acquire. You can read more about farming the gemstone here.
April 29, 2014: Chiltara’s Spawn Rate to be Fixed Soon
An official announcement has been made (April 29) about fixing Chiltara’s spawn rate in an upcoming patch. Looks like the drop rate for the gemstone will still remain pretty low, but Chiltara will spawn much more frequently at least.
Quote from Grimiku
I have some good news about Chiltara for those of you who’ve had a tough time finding her as of late. In a future patch, we’re going to increase the chance that she’ll spawn in the Caverns of Frost. Our intention with this change is to make it a bit easier for players to construct a Staff of Herding, but still keep the Gibbering Gemstone as the most difficult component to find: http://us.battle.net/d3/en/forum/topic/11883998315#2
Note that this change will only increase her spawn chance. The drop rates for the Gibbering Gemstone itself (as well as the Urn of Quickening, and Frozen Blood) will remain the same. (Source)
Patch 2.0.4 has dropped and still no fix for Chiltara. Blizz is still aware of the super low drop rate, but adjusting it is not a high priority at this time. 😐
This latest blue post states that the low drop rate, while maybe a bit too low, is intended; however, they do still intend to fix the drop rate in a future patch. Too bad it wasn’t fixed for 2.0.4, but sounds like it’s on the punch list at least.
Quote from Tsarnis
I wanted to post something here and mention this to clear up any confusion about it. Basically, due to changes implemented in patch 2.0.1 Chilltara is not appearing as often in the game world, which is making the Gibbering Gemstone more difficult to obtain that it was in patch 1.0.8.
We are aware of this and while this isn’t technically a bug (as this part of the Staff of Herding is meant to be the most difficult to obtain), we will be making an adjustment to Chiltara that should make this easier to obtain in a future patch.
We appreciate the reports and comments about this, but as we have officially addressed this here and in multiple other locations, additional reports about this are not needed. Thank you! (Source)
Previously, this abysmal drop rate was regarded as a bug, as confirmed by Blizzard here:
Quote from Vaneras
Posted by Shinobi
I have a feeling the Gemstone has been moved to somewhere in RoS act 5 since loot 2.0.
No it has not been moved to Act V, it still drops from Chiltara in the Caverns of Frost. There is a bug in play that has lowered the drop-rate dramatically so that it is now even rarer than it was before, but it still does drop. The current drop-rate is not intended and we are looking into fixing it, but there is no ETA yet though. (Source)
Quote from Vaneras
Posted by Mortiferus
Does the buggy drop rate currently depend on difficulty or is it the same low rate on e.g. normal or torment?
This bug is rather unusual from what I can understand, and unlike normal drop rates, difficulty doesn’t seem to matter much in this particular case. We should hopefully get this sorted out soon. (Source)
No word yet on when this will be fixed, and sadly, Patch 2.0.3 did not include any mention of it (nor did Patch 2.0.4).
We’ll keep our eyes and ears open for any new developments on this and will be sure to let you know once Blizz has addressed the issue!