First Spiritual Bone?

"Are you sure you can get it? I've heard of people getting bones a few years older than recommended, but never 5 times more... Are you sure?" she asked doubtfully, and Tang Yin nodded at her.

"Don't worry, I know what I'm doing. It will be simple; in a few hours we'll leave." He said firmly and began to synthesize.

In his world, all geniuses got their first spiritual bone from a 1,500-year-old beast, how could he keep something as simple as 500 years? 

The first time he got a spirit bone, he got it from a 2,500-year-old beast.

And this time, he will go for one just like it.

As the bearer of the Divine Soul, his talent is more than supreme, how could he go for less?

So, he began to synthesize his backbone...

It was a long process.

To synthesize is to give a bone-like shape to the spiritual energy of the slain beast.

It's like drawing. In drawing, you grab paint and a brush to form an art out of both materials.