Father of the grubs scattered across Hallownest. Upon finding all of them, the Knight will return to see Grubfather has eaten all his children. But don't worry, they're all still alive, and will safely metamorphose into Grubberflies. Just pray Grubfather passes away before then.

Your audition should use a voice similar to the in-game character's voice, which you can listen to here: https://youtu.be/p3dgdkFi8wk