After returning to the room, Zhang Tiantian called the system. "Tongzi, come out quickly and tell me how to operate the plane transaction?"

"Do you see the screen in front of you? There's a friend's page where you can chat and trade."

Gu Ranran looked at the screen and felt a little disappointed.

"We only have one friend, so we can only trade with one person?"

"Yes, you can only have one friend in one plane, but after leveling up, you can add friends from other planes."

Zhang Tiantian started chatting and sent a message first.

"Hello, my friend from the end of the world, we are in the Age Plane, we need crystal cores, what do you need, let's trade."

The friend also replied: "I only have the crystal core of the wind power and the crystal core of the lightning power, I can give them to you. Just give me some food, we are increasingly looking for food."

Gu Ranran brought over the egg cake, canned food and White Rabbit milk candy, and then Zhang Tian made the dessert transaction and the things were handed over.

After a while, two crystal cores appeared in the hands of Gu Ranran and Zhang Tiantian.

Zhang Tiantian quickly sent a message: "How do I use it?"

The friend replied: "Just take it in your hands and crush it. But you will usually fall into a coma, and the duration of coma varies from person to person. Our water is not clean in the end times, can you share some water with me?"

Zhang Tiantian replied: "Sure, but it's dark now, so it's not convenient. I'll share it with you tomorrow morning."

Friend: "Thank you. You can always look for me if you need anything in the future."

Zhang Tiantian: "Okay, let's cooperate with each other."

Zhang Tiantian said excitedly: "Ranran, let's start while lying on the bed. I'm so looking forward to it."

Gu Ranran said, "Tongzi, keep an eye on us two, we are about to start."

"Don't worry, you two. You'll definitely wake up in the morning. It's just a little sore."

Zhang Tiantian and Gu Ranran lay on the bed together, and then crushed the crystal core together.

It really hurt. Zhang Tiantian and Gu Ranran struggled at first, then screamed in pain, sweat started to pour out, and finally they fainted.