Arachnid Goddess

THE arbitrator herself of all territory makes a rare appearance in the Subterranea. And yes, the size isn't off in the bottom panel. She's pretty damn big compared to the others.

In regards to the tunnels and their inhabitants, Zanza-Anzulu is an important being, but a very background one. She's a neutral individual whose mushrooms are recognized as place markers for the veves that identify the extent of a clan's territory.

She has no controlling interest over anything, really, but her mushrooms benefit from the blood and death being shed all over the place so she gives back to the community, so to speak. As a whole, she generally doesn't appear (the shrooms will change on their own), but this was a special occasion as you might determine from her dialogue.