So how does she know what level she is at?

"Close your eyes and feel your Dantian." Yin Yin said, "Other superpowers have a crystal core in their Dantian. You have one too, but it's slightly different."

"Rather than calling it a crystal core, it would be more appropriate to call it a container."

"Container?" Qi Jinnuo was puzzled.

"Close your eyes and feel it."

Qi Jinnuo closed his eyes and focused his attention on his dantian.

I can indeed feel that there seems to be a red round object in my dantian.

But it is not a crystal core, but looks like a small wine glass with a groove in the middle.

“Do you feel it?”

"I feel it." Qi Jinnuo opened his eyes.

“It should be small now.”

"It is very small, as small as a teacup for drinking Kung Fu tea."

Yinyin: "It's normal to be small, because you haven't practiced much."

“…”

"Is there half a cup of energy in it?"

“…”

Qi Jinnuo felt a little aggrieved, "No."

Only a shallow layer.

"This container is used to store energy. The more energy there is in it, the more powerful your supernatural power will be."

"Then I have to find a way to fill this container?" Qi Jinnuo asked, "How can I fill it?"

“Practice, practice non-stop, until you are exhausted. Every time you gain a new insight, a new drop of energy is added to the container.”

"... Then how long will it take to fill it up?"

"You are in a small container now, it will be very fast."

“…”

“When it’s full, the container expands, and you keep filling it.”