In my opinion, it is a prayer, and from the sentence, it should be a chanting text of the Dharma Association, which is inferred to be used by the Dharma Association!
Some wizards have their own methods of prayer or summoning. From the point of view of "manna", it is another name for Buddha Amitabha. Amitabha incarnate. The name of Lu Wang Tathagata is mostly used when giving alms to hungry ghosts. In addition, there is the manna curse.
Behind the "arrival of the lonely soul Buddha" is to pray for the emergence of the Buddha to cross the lonely soul. Content is the purpose of the future.