This was Yan's first serious attempt to test the limits of Great Eruption in actual combat.
He had tried it a few times at the training grounds before, but the place had been too small. There had not even been enough room to unleash a Meteor Volcano, let alone a move like Great Eruption that required such extreme charging.
But today was different.
This stretch of riverbed in the Land of Grass extended several kilometers from east to west. Open. Empty. No civilians needed protecting.
The perfect testing ground.
Yan's right arm had completely transformed into magma. Dark red liquid churned and flowed over his arm as its temperature continued to rise.
Three thousand degrees.
Four thousand degrees.
Four thousand five hundred.
His Observation Haki caught Rock Iron's movements. A veteran was still a veteran. Rather than being frightened senseless, he swiftly made the most correct judgment.
"Earth Release unit! Defensive formation! Everyone, stack Earth Flow Walls! Stop his attack at all costs!"
The moment the order was issued, more than a dozen massive earthen walls rose in succession. They were not single-layered walls—they were composite walls made of four or five layers stacked together. Their total thickness exceeded ten meters.
This was already the sturdiest defensive measure in the ninja world. Even an S-rank Fire Release ninjutsu could only burn through the outer two or three layers of a ten-meter composite Earth Flow Wall.
Unfortunately.
What they faced was not Fire Release.
Yan drew his right fist back to his waist. The magma's temperature broke through five thousand degrees.
What did five thousand degrees mean?
The surface of the sun was roughly six thousand degrees.
Yan's fist was already approaching the surface of a star.
His entire right arm swelled. The magma rapidly expanded from elbow to fist, forming