Originally, Arthur's arrow-like tail left him feeling vulnerable and fragile. Due to his lack of subconscious protection, it often got hurt. However, things were different now, as he felt a surge of power emanating from his tail.

Upon completion of the transformation, Arthur heard a click in his heart, and the tail vertebrae rattled. His tail, now cruel and formidable, arched upwards under his command. It moved freely, responding to his will without delay.

Arthur admired his handiwork, satisfied that it now matched his body's shape. The tail had become sleeker, harmonizing perfectly with his appearance. Its dark red hue, matching his skin, gleamed like a gem, and it had grown even harder than he'd imagined. When Arthur flicked it, the dark red reflections flowed like flames, creating an intimidating image.

The three blades at the tail's tip could open and close smoothly, and when Arthur swung it with force, they cut through the air with a terrifying roar.

Satisfied, Arthur realized that the range of his tail exceeded its length due to the flexible joints between each segment. This surprise would undoubtedly be advantageous in combat. If an enemy judged the attack range based on visual inspection, they would surely regret it.

Examining his work, Arthur noted that not only had his appearance changed, but his attributes as well. His strength and speed had increased by 5 points each, resulting in attributes of 21 strength and 18 speed. He was puzzled about how tail modification had led to attribute enhancement.

Upon further investigation, Arthur surmised that strengthening his tail had also strengthened the muscles near his waist and thighs, enabling better tail control. This adaptability demonstrated the system's remarkable capabilities.

Satisfied with his transformation, Arthur relaxed but found himself overcome with sleepiness. It was the first time he'd felt this way in over a week. He prepared his cave for rest, ensuring no scent lingered, and then finally, with a strange fruit placed inside as bait, he closed his eyes.

In this underground world without a day-night cycle, Arthur didn't know how much time had passed when he awoke from a deep slumber. Stretching and hearing his bones crack in a satisfying manner, he felt invigorated.

Noticing a change in his size, Arthur observed that even his palms were larger than before. He tried to gauge how long he'd slept by examining the state of the fruit he'd placed as bait. It had decayed significantly, perhaps indicating two months had passed.

Arthur didn't possess a precise way to measure time in this underground realm, but he accepted that as a demon, time held little meaning. His main concern was not falling into an extended period of laziness.

Feeling rejuvenated, Arthur decided to explore this demon world further, but first, he needed to satisfy his hunger. Removing the remains of a monster from his cave and disguising the scent, he ventured outside to find sustenance.

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As he left his cave, Arthur was shocked to find the area near the tree cave covered in white spider webs. He knew there was a group of spiders nearby, but he hadn't expected them to expand their hunting territory to his residence within just two months.

Avoiding almost walking into a cobweb, Arthur was furious. Demons, like humans, had territorial instincts. So, Arthur made his first post-sleep decision: to eliminate these intrusive spiders that had invaded his territory.Originally, Arthur's arrow-like tail left him feeling vulnerable and fragile. Due to his lack of subconscious protection, it often got hurt. However, things were different now, as he felt a surge of power emanating from his tail.

Upon completion of the transformation, Arthur heard a click in his heart, and the tail vertebrae rattled. His tail, now cruel and formidable, arched upwards under his command. It moved freely, responding to his will without delay.

Arthur admired his handiwork, satisfied that it now matched his body's shape. The tail had become sleeker, harmonizing perfectly with his appearance. Its dark red hue, matching his skin, gleamed like a gem, and it had grown even harder than he'd imagined. When Arthur flicked it, the dark red reflections flowed like flames, creating an intimidating image.

The three blades at the tail's tip could open and close smoothly, and when Arthur swung it with force, they cut through the air with a terrifying roar.

Satisfied, Arthur realized that the range of his tail exceeded its length due to the flexible joints between each segment. This surprise would undoubtedly be advantageous in combat. If an enemy judged the attack range based on visual inspection, they would surely regret it.

Examining his work, Arthur noted that not only had his appearance changed, but his attributes as well. His strength and speed had increased by 5 points each, resulting in attributes of 21 strength and 18 speed. He was puzzled about how tail modification had led to attribute enhancement.

Upon further investigation, Arthur surmised that strengthening his tail had also strengthened the muscles near his waist and thighs, enabling better tail control. This adaptability demonstrated the system's remarkable capabilities.

Satisfied with his transformation, Arthur relaxed but found himself overcome with sleepiness. It was the first time he'd felt this way in over a week. He prepared his cave for rest, ensuring no scent lingered, and then finally, with a strange fruit placed inside as bait, he closed his eyes.

In this underground world without a day-night cycle, Arthur didn't know how much time had passed when he awoke from a deep slumber. Stretching and hearing his bones crack in a satisfying manner, he felt invigorated.

Noticing a change in his size, Arthur observed that even his palms were larger than before. He tried to gauge how long he'd slept by examining the state of the fruit he'd placed as bait. It had decayed significantly, perhaps indicating two months had passed.

Arthur didn't possess a precise way to measure time in this underground realm, but he accepted that as a demon, time held little meaning. His main concern was not falling into an extended period of laziness.

Feeling rejuvenated, Arthur decided to explore this demon world further, but first, he needed to satisfy his hunger. Removing the remains of a monster from his cave and disguising the scent, he ventured outside to find sustenance.

As he left his cave, Arthur was shocked to find the area near the tree cave covered in white spider webs. He knew there was a group of spiders nearby, but he hadn't expected them to expand their hunting territory to his residence within just two months.

Avoiding almost walking into a cobweb, Arthur was furious. Demons, like humans, had territorial instincts. So, Arthur made his first post-sleep decision: to eliminate these intrusive spiders that had invaded his territory.