Su Yi was eager to go back and discuss things with Dong Xuefeng, but he still needed to make some good arrangements before leaving.

At least we need to leave someone here to guard it.

Because many people have entered the forbidden land of death in recent days, it would be troublesome if someone came here and destroyed the Demon Planting Tower.

Su Yi thought about it and finally decided to keep the demon plant.

The number of demon plants is close to one hundred, and their combat effectiveness is not bad, so they are most suitable to guard the Demon Plant Tower.

After making the arrangements, Su Yi led everyone out of the valley, and after reuniting with Jing Jiaxiang and others, they returned quickly.

After returning to the barbarian territory, Su Yi entered a stone house and summoned Dong Xuefeng immediately.

"Lao Dong, I heard that your Poyuan Sect is a sect that studies formations?" Su Yi asked with a smile.

Dong Xuefeng nodded and said modestly: "It is indeed mainly focused on the research of formations, but the reputation is not very loud."

In fact, although the Poyuan Sect is a small sect, it has made considerable achievements in the research of formations.

Many sects and forces in Xuantian Continent have asked them to establish formations.

"I'd like to ask you for a favor." Su Yizhi said.

"Su Yi, you saved my life, just tell me what you want." Dong Xuefeng promised solemnly.

He is a man who knows how to repay kindness. Su Yi is his savior, and it is his duty to help his savior by doing something.

"It's nothing, actually."

Su Yi smiled and said, "I just want you to help me build a teleportation array to teleport the Monster Planting Tower here."

"There is no problem in building a teleportation array, but it requires ethereal stone as the main material, and I don't have a single piece on me." Dong Xuefeng said in embarrassment.

The teleportation array belongs to the space array, and to build a space array, one must use space spiritual materials, among which the most stable one is the space spiritual stone.

However, the ethereal stone is extremely precious and can be said to be a priceless treasure. It is rarely sold on the market.

"Ethereal Stone..."

Su Yi pondered.

A few days ago, he did snatch three ethereal stones from the orcs, but later he used them up when forging the [Obsidian Meteor Sword], so he didn't have them on him anymore.

"How many ethereal stones do you need?" Su Yi asked.

It is imperative to build a teleportation array. Even if the Void Stone is a rare treasure, we must find a way to get it.

"Two are enough." Dong Xuefeng thought for a moment and replied.

The longer the distance of the teleportation array, the more ethereal stones are required.

The Demon Planting Tower is only about 300 kilometers away from here, so we only need to build a small teleportation array, so naturally we don't need too many ethereal stones.

"Two."

Su Yi murmured thoughtfully, and then asked: "Where are the other materials?"

"I have all the other materials here." Dong Xuefeng said quickly.

The most important thing for building a teleportation array is the Void Stone. As for the other auxiliary materials, they are all ordinary materials, and he does have quite a few of them.

"I'll get the Void Stone as soon as possible."

Su Yi nodded and said, "Lao Dong, you go down and have a rest first."

"good."

Dong Xuefeng didn't say anything more and turned and left.

Su Yi stood there in deep thought for a while, then invited Ji Xiaoning, Jing Jiaxiang and Bai Shengju Xiaohu into the stone house.

"Su Yi, is there anything wrong?" Ji Xiaoning asked curiously.

"Senior, I want to establish a rear base here, and there are some things I need to discuss with you." Su Yi said.

Only Jing Jiaxiang knew about the establishment of the rear base; no one else was aware of it.