Kūmon

is a Hollow technique of opening a Garganta.

Description
Hollows and Arrancar can use special spiritual pathways to travel between Hueco Mundo and the other realms. These are called Garganta. A Menos Grande can open a Garganta by tearing through the barriers between the realms, thus creating a spacial distortion that opens a pathway. Gillians typically use this method to travel to the Human World.