The Council

A collection of spirits, The Council is an alternative to StarClan- However, when delivering messages, all the spirits of The Council come together to form a singular cat, known as.... well, The Council, which carries the knowledge of all of it's parts. It's power is said to rival that of StarClan, and possibly exceed it.
Worship of the council involves caring for the bones of fallen cats, most often skulls, to connect the dead to the living. The Council is linked to these bones, and creating shrines to contact The Council involve keeping and maintaining many bones of council cats. Those who neglect to clean the bones are said to be punished severely.
The Council's primary goal is to attain knowledge. It's members travel far and wide, watching over cats and learning the secrets of the world. 

In short, ghost cat hivemind