A Holy Light altar was set up every ten miles or so in the entire Land of Holy Light.
From Meng Chao's understanding, they were similar to signal towers.
The Holy Light race could open their minds through meditation and connect with the Holy Light altars.
As long as their faith was pure enough and their meditation was deep enough, the Holy Light race would be able to hear sounds similar to the Ancient Ruins' Summon and see a series of bizarre images in a trance. From these sounds and images, they would be able to receive a "guide" or even more specific, missions.
This guide also taught the Holy Light race cultivation methods and general as well as philanthropic instructions that existed in any religion.
As for missions, they included maintaining local order, identifying those with shaken faith, punishing heretics, and killing monsters that invaded the place. At the moment, the "monsters" were mainly the Chaos races.