The brand is very useful. It informs them of specific missions that mother high heaven wants to be completed. It will also keep track of the efforts of everyone towards the completion of the missions and report the data to Mother Heaven for the calculation of their contributions. They will able to see their contribution points through it without having to ask the realm lord or mother heaven.
He sneered at the demon kings and said to himself with disdain, "And to think they were too distrustful of the realm lord and removed the system from themselves. Now they have shackled themselves to the boat that is the realm of high heaven."