One Piece: With Sign-in System

When Ron piloted the flying device into the skies above Upper Yard, Enel, the wielder of the Logia-type Rumble-Rumble Fruit and the self-proclaimed god ruling Sky Island, opened his eyes within the upper levels of the Shandora ruins.

"Hmm?"

"An intruder in an unidentified flying device?"

Enel's eyes narrowed.

"Daring to trespass upon the divine island, hmph, it seems a trial is in order."

He immediately summoned his four chief priests, informing them of the specific location and ordering them to apprehend the trespasser who dared to intrude upon this sacred territory.

The flying device descended into a forest clearing within Upper Yard, and Ron stepped out.

With a thought, he activated the power of the King's Treasury.

The entire flying device sank slowly, disappearing into the void.

Ding! A system notification sounded in Ron's mind.

[Detected host's location: Sky Island. Sign-in available. Rewards can be claimed upon sign-in. Sign in now?]

"Sign in," Ron confirmed.

At that moment, he sensed the probing presence emanating from a great distance—it was unmistakably Enel using the power of the Rumble-Rumble Fruit to extend his Mantra across the island.

He should now be aware of Ron's position.

[Sign-in successful. Reward obtained: Vitality +10. Additional reward: Supreme Mantra.]

The system's voice had barely faded when Ron's mind felt as if something had exploded within it.

His eyes glazed over momentarily, a profound gleam emerging from deep within his pupils.

His Level 3 Observation Haki fully unfolded, rapidly expanding its range from hundreds to thousands of meters, encompassing the entire Upper Yard and beyond.

300 meters, 400 meters, 500 meters, 600 meters, 700 meters... 1,000 meters, 2,000 meters, 3,000 meters... up to 10,000 meters!

In that moment, like Enel's Mantra amplified by the power of his Devil Fruit, Ron's Observation Haki enveloped the entirety of Upper Yard. He could even "see" Enel reclining on a bed in the palace and the priests and guards rushing toward him.

Observation Haki Level 3 to Level 4!

"So this is... the ultimate extent of Mantra, the pinnacle of Observation Haki's range..."

Ron closed his eyes, immersing himself in the newfound power.

At the same time, within the upper levels of the ruins, Enel, who had been swept over by Ron's Observation Haki, felt a sudden shock.

"That sensation just now... Mantra?"

"Is it that outsider?"

With his long earlobes and white turban, Enel narrowed his eyes. Bare-chested, he rose from the bed, picked up his golden staff, and, with a dark expression, walked barefoot out of the room.

Such an intruder would face divine retribution!

The contest between Ron's Observation Haki and Enel's Mantra covered the entirety of Sky Island. The range was identical, meaning the battle now depended on the depth of perception and foreknowledge.

Enel mainly relied on the electric waves of his Rumble-Rumble Fruit to amplify his coverage, detecting enemies' muscle movements to predict their next moves. Yet, in terms of true precognitive ability, he hadn't progressed far.

Ron could vaguely sense this difference.

The first to reach Ron in the forest clearing was Ohm, one of the four chief priests known as the Sky Shepherd. Holding a long sword and accompanied by a giant dog and several divine soldiers, he advanced toward the black-haired young man standing with closed eyes.

"An intruder on the divine land, you have violated the god's decree."

Ohm raised his long sword, pointing it at Ron. "Now, I shall grant you divine punishment by death."

With these words, the giant dog and the divine soldiers charged toward Ron.

As they approached within three meters of him, the other three priests arrived with their men.

"Did Ohm get here first?" Sky Guard Commander Gedatsu remarked with a sly grin.

As the attacks closed in on Ron with closed eyes, Shura, the Heavenly Knight, felt a pang of unease.

Before another word could be said, Ron lifted his leg and delivered a powerful kick.

A long, teal wind blade enveloped in fierce gales swept through the divine soldiers, cutting them down silently like a scythe through wheat.

Seeing the wind blade continuing toward him, Ohm raised his sword in a defensive stance, hastily attaching a Dial to enhance it.

The wind blade pushed him back over ten meters before dissipating. Even after blocking the attack, Ohm's hands trembled, nearly losing their grip on his sword.

The other priests looked on, stunned.

"He deflected Ohm with a single move?"

"How..."

"This guy's strong! Attack together!"

Heavenly Knight Shura shouted as he charged with his spear, followed closely by the others who activated their Mantra to predict their opponent's moves.

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