Ten Miles

Upon entering the void in his mind, he saw an enormous Buddha and a huge Heavenly Demon standing with their backs facing each other while a large round mirror stood between them. 

The round mirror was as tall as them and looked dazzling and spotless. Its reflection contained the most minute details and it completely separated the Buddha and the Heavenly Demon.

This enormous Buddha had one body with two faces that made him seem odd and harmonious at the same time. One of the faces looked peaceful while the other had a calm expression, and they were chanting the Great Light Scripture and Maha-Vairocana's Immobility Scripture respectively.

The words from each scripture transformed into white and golden lotuses that drifted out of their mouths and floated around in the air before slowly descending upon the Buddha and toughening his body.