The beeping from the waist symbolized a message from the Ghost Maid stationed within the Undead camp.

Early that morning, Kane chose to wait here for this siege due to the unusual circumstances surrounding it.

According to the information from the Ghost Maid, the lich leading this attack intended to make it a major offensive.

Even if the fortress couldn't be broken, the goal was to severely weaken its defensive forces.

At the very least, they aimed to harvest plenty of strong corpses and souls.

However, since the Ghost Maid had only just infiltrated the undead ranks, she didn't know the lich's detailed plan.

She could only gather that the powerful lich had long prepared for this attack.

This meant that unexpected events were bound to occur in this battle, possibly stripping the fortress of its advantages.

In this most critical moment, it was Kane's group's turn to make an entrance.

The battlefield maintained its tense stalemate, even as the beeping continued.

The lich leading the attack continuously wielded his magic from his chariot.

Various undead magics were unleashed towards the fortress's defenders.

But to those watching, the lich seemed to be deliberately conserving his magic power, using only minor spells.

The fortress's mages intensified their efforts to clear the undead climbing the walls.

Fire and frost, with Arcane Missiles flying everywhere.

It seemed the fortress's supporting mages were ample, likely with support from some faction within the Holy Light Alliance.

Golden-ranked mighty warriors from both sides were locked in fierce combat.

All kinds of holy light magics erupted throughout the fortress, notoriously devastating against the undead.

Each radiant burst allowed the defenders to regain some upper hand.

Many defenders killed by the undead soon rose again, now fighting with their former allies' weapons and equipment.

More defenders, upon death, were dragged down by comrades.

Injured soldiers were pulled down for treatment below the walls.

Through the newly established sky surveillance, Kane and his company observed the fortress's interior clearly.

Many soldiers inside the fortress stood ready at the walls' edge, waiting to replace their long-fighting comrades.

Lines of transportation quickly moved the wounded to the center, where numerous cathedral healers and priests tended to their injuries.

In this well-defended fortress, the mixed-race armies worked in unison to keep the walls nearly clear of undead.

But then the lich would open new breaches with spells or a few strong undead would break through.

No one approached the main gate of the fortress, not even most of the undead showed interest in breaking through it.

Just glancing at the gate, dense with Holy Light Runes, was enough to declare it the toughest obstacle.

Previous siege attempts by the undead aimed to blast the gate.

Yet the gate's sturdiness and protective Holy Light barriers thwarted them time and again, leaving them at a loss.

In earlier defenses, the gate even served as bait for the undead.

After many failures, the undead finally understood it wasn't something to breach quickly.

Breaking the gate was less feasible than brute-forcing a section of the wall down.

"Haha, time for you all to take the stage," the lich's hoarse and indistinct voice echoed.

With his words, the sky's clouds began to thunder and flash.

Within the dark green clouds, Evil Spirit Beldams previously swirling within began swooping towards the walls in black and dark trails.

A bishop who had long awaited on the walls swiftly rose, opened his book, and began chanting, praying in hushed tones.

As his book exuded a faint golden light, the four surrounding Holy Light Crystals erupted with energy, enveloping the sky above.

The ring of golden energy caused the piercing shrieks of the Evil Spirit Beldams trying to pass through.

Many of the lower-ranked, weaker spirits fell from the sky and turned to ash before reaching the ground.

Yet some strong ones, relying on durable souls, successfully breached this barrier and began to harass the soldiers below.

These soul-constructed undead required little attack motions, simply phasing through and shattering the soldiers' fragile souls.

The undead were impervious to ordinary physical attacks and boasted incredible speed.

Soldiers lacking willpower and resilience fell one after another.

Most were mere recruits.

The bishop controlling the four crystals closed his book and spoke loudly.

"Knights of the Order, use your weapons and the Holy Light in your hearts to erase these vile presences."

At his command, figures rapidly ascended the walls.

Their powerful figures clad in heavy Silver Armor, adorned with golden patterns.