"That's about enough. Besides the demon lord, there shouldn't be many demons left in the castle."
With this in mind, Chen Mu adjusted the attack range of the siege cannons and began bombarding the crowded demon army below the mountain.
At this moment, the demon army that had rushed out numbered over 100,000. Although their individual strength was not particularly great, their combined combat power was immeasurable. If Chen Mu had not come prepared, even figures of the level of ten Heavenly Court Gods would probably have met their end here.
Boom boom boom...!
After the Devil Spirit Siege Cannon began attacking the army, they quickly caused massive casualties among the demon forces. However, the demon leaders were not stupid; they quickly ordered the demons to disperse and reduce the damage caused by the Devil Spirit Bullet.
Whoosh! Mingye suddenly appeared beside Chen Mu, holding hundreds of red crystals in her hand, and handed them all to Chen Mu.
Chen Mu didn't speak, but with a tacit wave of his hand, he controlled the red crystal to embed into the Devil Spirit Siege Cannon below, and the siege cannon, whose light had been gradually dimming, became bright again.
Tap tap... thud thud thud!
The battle between the two sides was extremely fierce. Chen Mu's Devil Spirit Bullet were incredibly lethal. After more than a dozen rounds of bombardment, the demon army of over 100,000 was gradually reduced to only 70,000 or 80,000.
However, at this moment, one of the siege cannons suddenly stopped firing and then spontaneously combusted.
"Sigh, temporary materials are indeed not durable."
This result was entirely within Chen Mu's expectations. The resources of the Destruction Grotto-Heaven were not abundant, and Chen Mu had put a lot of effort into creating these siege cannons. The fact that they could self-destruct after more than twenty rounds of bombardment was already a relatively ideal result.
After the first siege cannon spontaneously combusted, the remaining siege cannons were destroyed one after another in the subsequent bombardment. After five more rounds of bombardment, all the siege cannons were damaged due to overload.
"The demon lord hasn't made a move yet; he's quite patient."
After another half hour of fierce fighting, the demon army had only more than 40,000 soldiers left, and nearly half of the Specter Legion and Dharma Aspect True Body released by Chen Mu had perished. Only the Heavenly Stems War Soldiers were damaged due to their material.
"Come back, everyone!"
At Chen Mu's command, the Specter Legion immediately turned and retreated, while the Dharma Aspect True Body dissipated and transformed into Dharma Power, re-entering Chen Mu's body.
" Demon-Slaying Eight Trigrams Formation, activate!"
As the demon closed in, Chen Mu revealed his next trump card: a formation specifically designed to slay demons.
"Roar... wooa!"
The remaining demons didn't think twice, roaring angrily as they plunged headlong into the Demon-Slaying Eight Trigrams Formation.
"Zhen represents thunder, Xun represents wind, and Li represents fire!"
Chen Mu's hands moved in a series of hand seals, and bolts of lightning, flames, and whirlwinds emerged from within the formation, reaping the lives of the demons as easily as cutting melons and vegetables.
Whoosh... whoosh!
Just then, a blood-red figure flew out from the Demon Castle and rushed into Chen Mu's formation with lightning speed.
"Hmph! This old guy finally couldn't hold back anymore."
Chen Mu sat suspended in the center of the formation, observing the demon lord who had rushed into the formation, a solemn expression on his face.
The demon lord was about eighteen feet tall, with wings on his back, scarlet eyes, and long, sharp horns on his head. Just by standing there, a terrifying pressure rose into the sky.
Chen Mu's Demon-Slaying Eight Trigrams Formation was weakened by three-tenths under the suppression of this oppressive force.
"He's practically a lone commander now, how could he dare not come out?"
Zhou Xinle, who was leisurely sitting at the entrance, couldn't help but gloat when he saw the Demon Lord's exasperated appearance.
The demon lord is indeed powerful, but if he loses his subordinates, he cannot defend the demon castle by himself. After all, his physical strength is limited, and he cannot withstand a siege.
Therefore, he rushed into Chen Mu's formation out of desperation. If Chen Mu killed all the remaining Demon Warrior, he would be left alone and doomed once Chen Mu and his group recovered their strength.
Alright! Stop joking around, now it's time to get serious!
If we can kill this demon lord, we will complete our trial mission; otherwise, we will become his food.
As Chen Mu spoke, he suddenly unfurled a huge Bagua pattern in his hand, and with a flick of his wrist, a blood-red beam of light enveloped the Demon Lord.
"The Eight Trigrams are ever-changing; the Gate of Death is locked!"
The demon blood crystals forming the array around them began to spontaneously combust, and the power of the Demon-Slaying Eight Trigrams Formation suddenly increased several times over. Even the demon lord was briefly suppressed by the power of the array.
"Kill!"
Chen Mu conjured a Dharma Power spear in his hand, becoming one with the spear, and his entire being resembled a ferocious dragon as he launched a fierce attack on the demon lord.
Bang! Clang clang clang!
The Demon Lord lived up to his reputation as Half-God Level powerhouse; even with his power suppressed by the formation, he still managed to block Chen Mu's all-out attack.
But at that moment, Mingye appeared silently behind him, her dagger shrouded in thick gray mist, and stabbed the demon lord hard in the back.
"Roar..."
During his trials in the Reincarnation Grotto-Heaven, Mingye had already comprehended the Netherworld Scripture to the second level.
At this moment, besides the Netherworld Power, her dagger also carried a Great Dao of Reincarnation of Reincarnation. This power directly damaged the demon lord's soul, causing him to let out a painful howl.
" The Heart Fox Secret Art, the Heavenly Demon Wild Dance!"
Zhou Xinle's attack was perfectly timed. Taking advantage of the moment when the demon lord's soul was injured by Mingye, she also used a secret technique to disturb his mind.
" War Talisman Spell, Particle Light Blade!"
After a series of soul attacks from Mingye and Zhou Xinle, the demon lord's movements came to a halt. Taking advantage of this opportunity, Chen Mu gathered his strength in his palm and Dharma Power to condense an extremely refined Dharma Power longsword, which he then slashed fiercely at the demon lord's body.
With a hiss, blood flashed across the demon lord's body, but just when Chen Mu thought the battle could end there, his Particle Light Blade shattered.
"This is... Divine Power?"
From the demon lord's abdomen, a strange power suddenly burst forth with dazzling light. In an instant, the demon lord's injuries were completely healed, and his dazed soul also instantly regained its senses.
Slap! Slap!
He swung his fist, sending Chen Mu flying with one punch, and then sent Mingye flying with another.
"Puff...!"
The change happened too fast. The punch landed solidly, and even Chen Mu's powerful physique was struck so hard that he coughed up blood and his breath dropped.
Ignoring his own injuries, Chen Mu immediately activated the spatial beacon rune attached to Mingye, instantly appearing behind her and pulling her into his arms.
" Mingye, are you alright?"