Blackie licked his paws.

"That's all for the general knowledge."

Tang Wan did hear the meaning of difficulty and preciousness, but more importantly, it was not said.

"Xiao Hei, what is the role of the dragon crystal? It can't exist, and there will be no follow-up, right? Besides, you just mentioned consumption, since consumption, it must mean something, doesn't it? ”

Xiao Hei's paw licking paw suddenly stopped.

After a few seconds, he put down his paws and jumped back on the back of the sofa to meet Tang Wanyin's confused eyes.

"I've only heard rumors about the use of dragon crystals, but I haven't really seen it with my own eyes. If it's wrong, don't blame me. ”

Tang Wan nodded vigorously.

"Don't worry, whether what you say is right or not, I will never blame you! You've solved my doubts, and I thank you that it's too late. ”

Xiao Hei handed Tang Wan a look of "You are sensible", was silent for a few seconds, and continued to explain.

"According to legend, in layman's terms, Dragon Crystal is, in some senses, a bit like the Aladdin Magic Lamp in your human fairy tale, which can fulfill a wish. It's not a panacea, but there's a lot it can do. ”

"But one can only choose to complete one of them, so most dragons use it to keep it for longevity. Wait until your life is threatened, or even on the verge of death, use dragon crystal to save and extend your life. ”

Tang Wan was shocked by this explanation.

"Save and prolong lives? Are you saying that this dragon crystal can ...... Back? ”

"Legend has it that there is such a saying, but this dragon crystal is only effective for the owner, and the dragon clan who really uses the dragon crystal to continue his life will feel ashamed, so no dragon clan has really wantonly preached it, and these statements are still legends to this day."

Longevity...... Back......

Tang Wan suddenly thought of his rebirth.

She remembered that during the hypnosis again, she felt her being embraced by a familiar embrace before real death came.

Although it was only for a moment, she was 100% sure that it was Si Nanyuan's embrace.

And judging from the man's words today, Si Nanyuan used to have dragon crystals, but now he doesn't.

Could it be that Si Nanyuan used his dragon crystal to resurrect her?

No, it doesn't make sense.

According to Xiao Hei, Long Jing can only take effect on the master, that is, it can only take effect on Si Nanyuan.

What's more, Long Jing can continue his life, not be reborn.

Even if those legends are thrown away, Long Jing still has any secrets that Xiao Hei doesn't know, and it really saved her life, then she should continue to live from that time, and she shouldn't be reborn.

But these ...... Is it really just a coincidence?

But apart from that incident, she really didn't know what else Si Nanyuan had that threatened his life and needed him to use dragon crystal to save his life.

She was not on the verge of death after being reborn, and was about to go to see Hades.

So why?

Tang Wan racked her brains and pondered.

Seeing Tang Wan's state, Xiao Hei didn't say any more, silently returned to her lap, crossed up and rested.

Tang Wan thought about it for a long time, but she couldn't come up with a reason.

After struggling for a few seconds, he took Xiao Hei off his lap and put it aside.

I turned around and went to the kitchen to make a cup of coffee, walked to the second floor with the coffee, walked to the door of the study, and was just about to raise my hand to knock on the door, but Si Nanyuan's voice came from the study......