Flying Jade Dragon 3,000,000

Lin Xuan transmigrated into a world where demon beasts rampaged. He became one of the lowest ranking wasteland reclaimers in the Germinal Organization to explore the mystic realms.
The Zero Realm mystic realm was the Giant Rock Cave. The First Realm mystic realm was the Demon Ant Nest. The Second Realm mystic realm was the Tree King Sea.
[Congratulations on seizing a Gold Swallowing Lizard as one of your avatars for gaining more experience. Do you want it to begin its training?]
[Your current location is first floor of the Giant Rock Cave. (1 coin per minute. 5 exp points per minute)]
[Gold Swallowing Lizard has been training for 4 hours. Do you wish to collect its experience?]
Lin Xuan’s eyes were wide open. He was well-versed in how this worked. This was similar to the AFK games that he played in his previous world. 
As such, he began his comfortable journey of becoming the strongest. 
Up until one point, the Germinal Organization discovered that he was abnormal and decided to deal with him. It only then did Lin Xuan realize that even Seventh Realm fighters and the managers of the organization were inferior to him.     

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I Have 10 Training Avatars

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The reserve team captain looked up in surprise and saw Lin Xuan throw out a huge thunder spear as he spoke to them after turning his head.

The Thunder Rock Marrow was already recognized as the most suitable item to be used as fuel for the Lightning Tower.

However, there were only two ways to obtain this thing.

One way was to search carefully in the belly of the Falling Thunder Mountain and find the Thunder Rock Marrow that condense naturally.

Another way was to find them in the bodies of powerful demon beasts.

For this matter, Old Wu and the others had a headache for a long time.

However, why was it that this guy could actually take out so many at once?!

Mu Yang's laughter also stopped abruptly. He said suspiciously, "I remember that you only took out a few Thunder Rock Marrow in the last medium-sized beast tide. Do you still have more?"

Why Do You All Have Thunder Rock Marrow?