"Was this just a glimpse of the World Government's hidden strength?"
Roy looked at the ships flying the World Government's flag and the large number of Marine warships.
Through the Echo Map, Roy could tell that the fleet escorting the Celestial Dragons contained quite a few unfamiliar yet powerful presences.
The foundations the World Government had accumulated over nearly eight hundred years of ruling the world.
Today, Roy had truly witnessed a hidden corner of it.
The Echo Map was different from Observation Haki.
Compared to Observation Haki, this ability was far more covert.
Unless someone with Yonko-level strength was on high alert, it was generally difficult to detect.
By emitting and gathering ultra-low-frequency sound waves, Roy could collect whatever information he wanted.
Within Roy's field of view, relying solely on the echoes of sound, he discovered several presences strong enough to threaten him.
"Were they the Knights of God?"
Roy looked inscrutably at the massive ship surrounded by warships.
"Hmm?"
Powerful Observation Haki instantly swept through the surrounding area.
"Why did it feel like someone was scanning me?"
On the enormous, luxurious ship.
Saint Gellinger, who had been sunbathing, suddenly unleashed his aura with all his strength.
His overwhelming presence swept across the entire area.
Several Celestial Dragons who had been fawning around him instantly collapsed to the ground.
"W-What's going on?"
The Celestial Dragons who had fallen immediately shouted at the people around them.
Ignoring his fellow Celestial Dragons' embarrassing state, he scanned the area. After finding nothing unusual, he slowly withdrew his Observation Haki.
"Was that just an illusion?"
He rose to his feet, gripped the hilt of the sword at his waist, and looked around.
Meanwhile, at the harbor, Roy wiped the cold sweat from his face.
"Good thing I withdrew the Echo Map in time.