Grillerpillars are enormous red/fuschia caterpillars with orange undersides and spots on the side of their bodies and green faces. They have six purple limbs and a purple mouth, as well as two green spots on the side of its head that look like eyes. Grillerpillars have a sharp stinger at the end of their tail, but their main form of offense is their ability to breathe fire at enemies. Like the other caterpillars in its family, it also attacks physically by rolling up into a ball and poking with their stingers.
Grillerpillars appeared from the very beginning of the game. They are much stronger than their original appearance, having the ability to breathe out Inferno now.
Grillerpillar appears as a C-rank monster of the Nature family. It can be scouted from Chapter 16, Episode 3: Something Bodes Ill, as well as Chapter 1, Episode 4 of the event quests of the limited "Serious Showdown!? White Hot Sweets Contest" at any difficulty. It can participate in Frankengolem and the Sweet troll's Battle Roads as a party member.