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Generally speaking, there were only two ways for disciples to level up.

One was to exchange points or obtain knowledge books from the auction houses outside to open one's horizons and learn knowledge.

The other was to go to the Military Department and exchange for knowledge books through Military Merits. He would directly let the instructors with high-level knowledge chant scriptures to help them successfully obtain knowledge.

Of course, he could also obtain knowledge books through the auction house.

Low-level and intermediate-level knowledge books required fewer Military Merits.

That was only for people like Dong Lei. The cost of Military Merits was just like sprinkling water.

To NPCs and gamers, that was an astronomical number!

For example, the Four-Diamond, Five-Diamond, and Six-Diamond Knowledge Books that Dong Lei had exchanged for required more than 100 million Military Merits.