In Chapter 886, Yi Feng stayed in the valley for most of the month, and also spent most of the time in the secret room with Huo phosphorus. Obviously, under the dense energy of the chamber of secrets, Yi Feng stepped into the fourth level without any suspense.

when Yi Feng stepped into the fourth level, he finally stopped devouring energy crazily. Feeling the abundant fighting spirit in his body, Yi Feng was reluctant to leave the fire valley. Obviously, his practice here was several times faster than that outside.

but I can only think about it, so when he reached the fourth level, he never entered the secret chamber...