Behind-the-scenes Gods in charge of Heaven, Earth and Sea, they maintain the balance of things in cooperation with the SAN-QING. They wear nice robes, have long black false-looking beards, and sit on thrones looking very regal and wise.
If required, the SAN-GUAN can offer happiness, forgiveness and protection from most things. But they are somewhat aloof and the bureaucracy of DAOist Heaven is not easily negotiated. However, they have a direct line to the JADE-EMPEROR. (They appear to be speaking into microphones, but it is possible these are closed fans.)
Unless you have a PI-DISC or very good connections, we suggest you try to contact someone further down the ladder.