Pistachio Firefly is an S-grade pet released on 30 October 2014. This pet will release a special jelly that would give an energy and blast jelly at the same time (similar to the combination of Mini Energy Potion and Blast Jelly). Due to this combination, the effect of both jellies will also apply in this pet. For instance, Pirate Cookie's Ghost will not be able to take the special jelly (not even for blasting) because they are considered to be Potions for the game. Also, buying the Power Jellies Boost at the start of the run will increase the length of blast speed.
Beyond the Witch's lair lies the forgotten pistachio forest which glows a luminous bright green at night. This light is created by the Pistachio Firefly, an extra-bright firefly unique to the forgotten forest. Although they buzz around restlessly and are always worried that their nutty and delicious insides will be eaten, they smell like hot roast chestnuts and light your way on long dark runs.