The Battlegod Catalog was a peerless-grade saint-tier cultivation art. Hence, the difficulty of cultivating it could very well be imagined. Ordinary people wouldn't have the chance to learn it even if they used their entire lives to do so. As for outstanding geniuses, they most probably needed above a hundred years if they wanted to learn everything up until the seventh level.
But right now, Sun Mo had directly grasped everything through a great teacher halo. Although the might wasn't as powerful as it would be if he used the seventh-level move...
(Wait a minute.)
The Battle God thought of another question and decided to hurry up and ask.
"I remember that great teacher halos will improve as the great teacher's cultivation realm rises. Their might will be enhanced. In that case, for this halo…"