On the humble wooden bed, Green opened his eyes, and he was greeted by an off-white stone ceiling.

This is the castle on the floating island, which has been cleaned up and renovated to become Grimm's temporary castle. The furniture was crude, and there were no luxurious decorations, but at least it looked somewhat decent - at least the bedroom Green was using looked normal.

The room is very spacious, like a nobleman's bedroom, but the furniture inside is very simple, not even a carpet, there is nothing to be called "luxury", "spacious" is the only advantage of this room.

"Chikage, good morning." Green lifted the thin quilt from his body and got out of bed.

"Master, your clothes." The brunette maid stood aside with clean clothes in her arms.

"Hmm." Green took the clothes from Chikage's hand and put them on.

Soon, Green got dressed, walked to the balcony, pushed open the two balcony doors, and walked out.

Standing on the balcony on the third floor of the castle, the ruins of a magnificent and busy city appeared before Green's eyes!

Under the floating island, roadwalkers pull horse-drawn carts filled with stones, lime, wood and other building materials to transport them to the edge of the lake under the floating island, and the flying dragon is responsible for transporting the stones to the island. On the island, Mona commands the gargoyles to rebuild the ruins of the island with cement made of stone and lime.

The whole island is a busy and thriving scene.

"Master, breakfast is ready." Thousand Shadows reminded as she stood behind Grimm.

"yes, I see." Green turned around and followed Chikage out of the room.

The castle is still very rudimentary, lacking elaborate carvings and decorations, but some of the most basic frames have been completed and take on a "rugged" appearance, except that most of the rooms are empty - uninhabited and unfurnished.

Walk through the hallway and down the stairs, where Beladona has been waiting for a long time in the restaurant on the first floor.

Seeing Green appear, the blonde girl stood up and rushed towards Green: "Daddy! ~”

The soft delicate body rushed directly into Green's arms, and two soft balls of flesh squeezed on Green's body and rubbed against Green's body. The girl's clothes were very cool and thin, the white dress could not cover the girl's plump body at all, and the soft skin was as smooth as milk, which made Green a little dazzled.

"Hmm~ Nana, I've been waiting for a long time." Green reached out and patted the girl's slippery shoulder.

"Hmm~" The blonde girl hugged Green and rubbed it on Green like a kitten.

"Alright, sit down in your chair, it's almost time for us to eat."

"Okay, Dad." The girl reluctantly walked away from Grimm and obediently sat back in her chair.

Soon, Mona, who was in charge of the food, brought the food up.

The wooden plate is filled with dishes made with vegetables, fruits, insects, and mushrooms. Although Mona, who is in charge of the kitchen, has worked very hard, the taste is really not delicious due to the lack of ingredients.

Food in Miracle Canyon is so scarce! A large number of monsters have completely destroyed the ecological balance here, except for insects and plants, ordinary animals cannot survive here at all, and even the rivers below the floating island only have various aquatic plants and no aquatic life.

Of course, if it is vegetables and fruits, it is quite abundant.

"By the way, Nana, the wheat I planted before is almost ripe, isn't it?" Green asked the blonde girl.

"Hmm...... Probably. The girl nodded vigorously, "Soon Daddy will be able to eat delicious bread and noodles." ”

After breakfast, Green and Chikage took the wooden sword and tried it out in the backyard to hone their swordsmanship skills and digest the food by the way, after which Green made a tour of the territory and checked the progress of the Monas, and then it was time for lunch.

After lunch, Green told Beladonna to stay at the castle and rode the wyvern to the Magic Crystal Mines.

The changes in the mine are not too big, they are still the same humble appearance, except for the addition of a log cabin for resting.

After arriving at the mine, Green walked into the cabin and instructed Chikage to take care of his body, after which Green lay down on the bed and fell into a deep sleep.

Meanwhile, in the underworld, Black Mona Green opened her eyes.

Black Mona Green got up from the ground.

"Mona! ~" The Mona who were standing around Grimm raised their hands and gave Grimm a salute.

The red crystal eyes scanned the surroundings, and then Mona Green opened the system map and began to check the Mona's location to see how far the excavation was going.

"Did anything happen while I wasn't there?" Green asked his men.

The Mushroom Forest is the only magic node in the area, and when they run low on energy, the Monas return to recharge their batteries and report their findings. When Green goes live, the other Mona will report back to Green.

"Mona Mona~"

"Hmm...... It's okay. So let's go back to the mines. Black Mona Green took his subordinate Mona and began to walk back along the map.

Soon, Green led the Mona to a railroad track—a stone track, to be exact.

Due to the severe lack of metal ore in Miracle Canyon, the vast majority of tools are made of stone and wood, even the railroad tracks. The carved stone slabs of the tracks lined up along the tunnel into the distance, and a small cart that looked like a minecart was parked on the tracks.

Green and the two Mona climbed into the cart. The two Mona grabbed the cart's power plant, and Green unlocked the limiter.

"Mona~Mona~Mona~" The two Mona shouted slogans while constantly moving the power unit up and down like a seesaw. The car started and started to accelerate, then faster and faster......

The rail car is undoubtedly moving much faster than Mona's.

Thanks to the efforts of the two Mona, the rail car makes its way through a long tunnel to the final destination: the Magic Crystal Mine.

After the Demon King level is upgraded, the heart can be separated from the body, which gives Green the ability to resurrect and the ability to fight on two fronts. But at the same time, it also caused some trouble: the "Demon King's Heart" is the source of the Demon King's power, and it is a device for storing Chaos Mana, which means that Green will not be able to use/store Chaos Mana without bringing his own heart! On the other hand, the "Demon King's Heart", as the heart of the Demon King, does not have a "digestive function" itself, and even if it is parasitic on Black Mona's body, the efficiency of absorbing the magic of chaos is very low.

Therefore, if he wanted to quickly convert those magic crystals into chaos magic, Green would have to merge his body and heart. Although it is a bit troublesome, it is not unacceptable compared to the convenience brought by the two-line operation.

Soon, Black Mona and Green meet.

Black Mona spits out the Demon King's Heart from her stomach.

Green got up from the bed, picked up the dark crystal, and stuffed it into his chest! The "Demon King's Heart", which looks like a black crystal, is directly integrated into Green's heart.

Demon King Green has finally returned to his "full form".

Green clenched his fists: "Sure enough, it feels better to be in full form." ”

After returning to her full form, the two Mona were responsible for taking care of Black Mona's body, while the fully formed Demon King Green walked out of the room and came to the mana crystal warehouse in the mine.

"Mona! ~" Mona, who was in charge of the crystal warehouse, raised her hand and saluted Grimm.

"Show me the notebook."

"Mona~" Mona handed the notebook to Green.

There were even fewer mana crystals in the warehouse than Green had expected.

As a group of magical creatures who live on magic, Mona is very sensitive to magic and can sense magic crystals from several meters away, which makes Mona far more efficient at mining magic crystals than humans - humans mine by luck, while Mona are able to locate their targets from a few meters away.

However, after several months of excavation, the mana crystals near several mana nodes have been dug up, and if you want to mine mana crystals, you can only dig them far away, which greatly affects the mining efficiency of mana crystals.

Green glanced at the notebook in his hand, and then at the magic crystal in the warehouse: "Mining efficiency is getting worse and worse." ”