Mistake

Hunter's Journal
Mistakes are enemies in Hollow Knight. Former scholars of the Soul Sanctum, these bugs' bodies were deformed by the Sanctum's experiments with Soul.

Behaviour and Tactics
Meanders back and forth, charging at the Knight when in range. May occasionally appear out of the ground.

Location
Large numbers of them are located in the Soul Sanctum, occasionally appearing out of the floor. It will respawn upon leaving and re-entering the room, appearing out of the floor once more.