"Here, Room Mystic-72." The administrator handed the key to Lu Yu, which was actually a token controlling the array within the retreat chamber.

Lu Yu found Room Mystic-72 and entered it.

The retreat chamber was very simple, with only a cushion placed in the center of the room.

The walls of the chamber were made of Tian'gang Stone, which even Martial Cultivators at the Core Formation Realm couldn't damage. Without the control token, no one could enter the retreat chamber. The walls were engraved with numerous arrays, as were the floor and even underground.

After entering, Lu Yu closed the door, placed down the Dragon-breaking Stone, completely sealing the retreat chamber. The arrays within the chamber activated, gathering Spiritual Qi. The concentration of Spiritual Qi rose rapidly, quickly increasing to three times the ordinary environment.

He opened the Spiritual Fusion Pool in the chamber; the concentration of three times Spiritual Qi was still far from enough. The Mystic-level retreat chamber could gather up to ten times Spiritual Qi concentration.

To achieve higher Spiritual Qi concentration, Spirit Stones need to be consumed. Lu Yu placed 40 Spirit Stones into the Spiritual Fusion Pool, which were crushed by the pool's internal array. Dense Spiritual Qi sprayed forth, raising the room's Spiritual Qi concentration to four times.

He continued adding 10 Spirit Stones, and the concentration increased to five times.

Lu Yu moved his body slightly, not feeling any pressure, and continued adding 10 Spirit Stones.

...

When the number of Spirit Stones in the Spiritual Fusion Pool reached 90, Lu Yu felt the room was about to be submerged by dense Spiritual Qi. The Spiritual Qi concentration was already nine times the regular environment.

A considerable amount of Spiritual Qi concentrated in one room caused enormous pressure on it. The arrays in the room operated at their limit just to prevent Spiritual Qi from spilling out.

Even Lu Yu, whose physique was extraordinarily strong, felt significant pressure.

He now couldn't move freely within the room; the surrounding Spiritual Qi felt like thick glue, making it very difficult for him to wave his arms.

Under the pressure of nine times Spiritual Qi, Lu Yu felt his body undergoing some changes, so he took out 10 more Spirit Stones and threw them into the Spiritual Fusion Pool.

The Spiritual Qi concentration in the retreat chamber reached ten times. Lu Yu felt somewhat dizzy, seemingly intoxicated by the high concentration of Spiritual Qi.

This is the phenomenon of Spiritual Qi reflux due to excessive concentration in the environment. If Lu Yu's physique wasn't strong enough, he would already be bloated by the room's Spiritual Qi, instead of just feeling dizzy.

After an hour of cultivation, Lu Yu's Spiritual Power limit increased by 10 points; the Spiritual Qi concentration decreased to four times and continued to drop.

Lu Yu took out 100 Spirit Stones and threw them into the Spiritual Fusion Pool, causing the concentration to rise back to ten times.

After several consecutive times, Lu Yu simply dumped a pile of Spirit Stones into the Spiritual Fusion Pool, which devoured them at the speed of 100 Spirit Stones per hour, causing the arrays in the retreat chamber to overload, revealing hidden array patterns.

With sufficient Spirit Stones in the retreat chamber, the cultivation speed increased more than tenfold compared to the regular environment.

Apart from sleeping, resting, and going offline to set up arrays, Lu Yu cultivated nearly 12 hours a day on the Celestial Patrol Treasure Ship, but it took two days to increase his Spiritual Power limit by 13 points.

In the retreat chamber, one hour could raise the limit by 10 points, boosting the cultivation speed nearly twentyfold at the cost of consuming 100 Spirit Stones every hour.

In the retreat chamber, Lu Yu truly experienced each and every moment of growing stronger.

Four days later, with six hours remaining before the double experience buff ends, Lu Yu left the retreat chamber.

As he walked, the nearby disciples of the Divine Weapon Pavilion couldn't help but turn their heads to look at him.

After spending over four days, nearly five days, in a chamber with ten times Spiritual Qi concentration, every pore on his body was emitting Spiritual Qi, resembling a walking thousand-year Spirit Ginseng.

Speaking of the thousand-year Spirit Ginseng, this was the reason Lu Yu could leave the retreat chamber ahead of time.

After cultivating until the third day, Lu Yu's ice-fire Spiritual Power exceeded 700 points, causing his cultivation speed to slow considerably. Over the third and fourth days combined, the increase in Spiritual Power limit barely reached 200 points.

Keep in mind that during the first and second days, he was increasing at a rate of over 200 points per day. During the third and fourth days, his cultivation efficiency dropped to less than half of that.

When his ice-fire Spiritual Power reached over 800, Lu Yu recalled the Spirit Ginseng sent by Han Mansion. After consuming it, his Spiritual Power limit increased by over 100 points, reaching the ninth level of the Qi Cultivation Realm, stabilizing his realm.

Currently, Lu Yu's ice-fire dual Spiritual Power limit is 963, with a total Spiritual Power limit of 1926.

His Qi Blood remained at 999 points. Although Qi Blood didn't increase, Lu Yu sensed a significant change in his body.

Now, taking advantage of the last six hours of double experience, he headed to the Tongtian Tower to reap experience.

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