Through the senses of the mustard seed, Jiang Hao discovered that in the northernmost part of the domain, a thousand kilometers north of the northern ice plains, a boundary barrier had collapsed.

Jiang Hao didn't know where the other side of the boundary barrier led. He only felt an endless chill seeping in from the hole in the barrier. The cold air froze the Spirit Ruins Sea below the hole until the sea surface north of the northern ice plain was completely frozen. Only then did the cold air invade Dingbei City along the northern ice plain.

Dingbei City was originally built from large blocks of ice, so it was completely unaffected by the cold air. In fact, due to the increased cold air from the unfrozen river surrounding Dingbei City, the seven-colored ice spirit fish in the secret chamber of Dingbei City even showed signs of becoming more lively.

The area around Dingbei City was in dire straits. In just a few days, the cold air gradually spread from the north of the Northern Ice Plains to the south, and from west to east, it had already covered the entire Northern Ice Plains.

Wherever the cold air reached, the earth froze into ice, and snowflakes began to fall in a flurry, raging down from the high sky towards the vast northern ice plains.

Standing atop the city wall of Dingbei, Jiang Hao gazed up at the north. There, a colossal, dark monster seemed to lurk, capable of destroying and devouring everything. It roared silently at Dingbei and the allied forces of the five tribes on the northern ice plains.

Jiang Hao felt a little breathless.

Even with Zhu Lin's magic shield, the feeling didn't improve at all.

After waiting for another three days, the total number of soldiers from the five tribes who came to provide support had reached 23.8 billion.

A human-controlled starship was the first to fire its main cannon at the hole in the boundary barrier. Then, starships controlled by the other four races followed suit, each firing a shot in the same direction.

The entire domain fell into silence.

It wasn't until Jiang Hao sensed it through the mustard seed that the three-square-meter hole suddenly collapsed, with pieces of invisible spatial barrier falling away, like a mirror shattering.

Then, there was another silent crash. Jiang Hao "saw" that the boundary barrier, stretching nearly a thousand kilometers from west to east around the hole, shattered in an instant. As the invisible boundary barrier pieces fell, the skeleton soldiers standing behind it finally revealed their hideous faces.

They were few in number, only about 100,000 in Jiang Hao's perception, but their strength was terrifying, all of them were... Diamond level?

It's diamond grade!

In other words, the skeleton legion's individual strength already surpassed that of any legion of the five major races the moment it appeared.

Behind the legion of 100,000 diamond-level skeletons lay a dense fog, impervious even to the senses of a mustard seed. Jiang Hao couldn't immediately discern whether more summoned creatures might be hidden within that fog.

With a deafening roar, all the human warships opened fire on the mist. Closely following behind were the warships controlled by the other four races.

One after another, diamond-grade energy crystal projectiles, accompanied by a mournful roar and an aura that seemed to cleave mountains and rivers, blasted towards the skeleton army.

The commander was naturally Yun Xinghe.

However, in Jiang Hao's perception, the effect these shells could achieve was far less than the momentum they exerted.

Just as the cannonballs were falling into the air, the diamond-level skeleton monsters leaped up, using the cannonballs that had just landed in mid-air to rise again, and finally landed lightly on the warship.

The diamond-level skeleton army has a jumping ability of 1,500 meters. The warships that were traveling at an altitude of 2,000 meters were easily charged up by the vanguard of the skeleton army.

This was something Yun Xinghe could never have imagined.

He made a quick decision, immediately deciding to abandon ship!

Fortunately, the first wave of attacks consisted of human mid-sized star-level warships. Even so, it still caused the human generals considerable distress.

At Yun Xinghe's command, all the soldiers in the medium-sized warships summoned their aerial mounts. They emerged from the warships through the cannon ports that were spread all around them, and then flew south towards the northern ice plains.

However, the skeleton legion that leaped onto the warships seemed to possess sentience; with a nimble leap, they directly jumped onto the soldiers, intending to easily infiltrate the five-tribe army behind Dingbei City as the soldiers fled.

Needless to say, by the time the five races' armies have wiped out this legion of 100,000 diamond-level skeletons through hand-to-hand combat, their entire battle formation will probably have been disrupted long ago.

At this moment, Jiang Hao suddenly realized that a hundred thousand diamond-level skeletons had once again emerged from the hole in the boundary barrier a thousand miles away.

Jiang Hao instantly guessed the Skeleton Legion's objective: to use 100,000 diamond-level experts to disrupt the formation of the five races' armies, creating an opportunity for the Skeleton Legion to launch a rapid attack from the rear.

With the Skeleton Legion's diamond-level strength, let alone using such a tactic, even if they directly pushed forward, the five-race alliance would have no chance to resist.

At the same time, Jiang Hao received a message from Yun Xinghe.

"Summon the little skeletons, but the difference in strength is too great; there's simply no chance."

Jiang Hao originally thought that with the concerted efforts of the five races and Yun Xinghe's command, even if the Skeleton Legion was powerful, they would at least be able to put up a fight.

But who could have imagined that the Skeleton Legion's first appearance would be a diamond-level blow to everyone's confidence? And through the mist, who knows how many Skeleton Legions are hidden on the other side of the boundary barrier?

Jiang Hao had no choice but to summon his little skeleton through the summoning space.

A flash of white light appeared before Jiang Hao's eyes, and the little skeleton appeared beside him.

At the same time, Jiang Hao was stunned.

He noticed that when the little skeleton came to his side from the summoning space, he could sense fluctuations in the summoning space.

This is really strange.

Jiang Hao had previously summoned his summoned creatures from the summoning space many times, or sent his summoned creatures into the summoning space.

But this time, Jiang Hao sensed fluctuations in the summoning space.

What made Jiang Hao's scalp tingle was that the fluctuations in the summoning space he sensed were exactly the same as the fluctuations in the space outside the boundary barrier a thousand miles north of Dingbei City!

Jiang Hao felt his entire scalp go numb.

Ignoring Yun Xinghe's pleas for help, he casually refined over a thousand mustard seed clones in mid-air.

Then, he attached 600 mustard seed clones to the little skeleton and sent the little skeleton into the summoning space.

Meanwhile, the other 400 mustard seed clones had already been quickly moved to the boundary barrier a thousand miles away.

The moment the 400 mustard seed clones pierced through the boundary barrier, Jiang Hao began to tremble.

Large beads of cold sweat dripped from his forehead, only to be dried by the raging north wind. Even with Zhu Lin's oval magic shield, Jiang Hao still felt incredibly cold.