If you think the drop rate for the Gibbering Gemstone is bad, you might want consider why you’re actually trying to gain a Staff of Herding…
| Whimsyshire | Whimsydale | |
|---|---|---|
| Accessed by | Staff of Herding | Portal left behind by Rainbow Goblin |
| Weapon 1 | Spectrum | Spectrum |
| Weapon 2 | Horadric Hamburger | Horadric Hamburger |
| Rare Cosmetic | Rainbow Portrait Frame | Cosmic Wings |
| Loot levels | Poor. Pre-ROS content | Excellent. Post-ROS content |
Unless you’re specifically hunting for the Rainbow Portrait, there’s very little point these days, and the spawn rate of the mob that drops the portrait frame is way, way lower than the mob you’re currently farming.