Demon Lord's Reincarnation

Hilda with her group of adventurers charged towards the undead mages. Even though they were a bit scared the adventurers that stayed were veterans and were not strangers to the stench of death. In fact, it was better that only adventurers with C rank and above remained since they were useful. If any adventurer below C rank stayed they would've only added to the undead army's forces. 

The undead mages seeing the approaching adventurers shifted their attention to them. Hilda was quick to react as she shouted at the adventurers. 

"TURTLE FORMATION!" The adventurers that held shields formed a shield wall while the mages created mana barriers surrounding them. The barrage of spells couldn't break through the adventurers' formation, and once Hilda and the others got close they would quickly dispatch the undead mage and incinerate the bones so they couldn't be revived. 

Hilda and her group repeated this action a few more times. Whenever they were about to be surrounded Kithra would provide support from the wall. 

...

While Hilda and her group of adventurers were destroying the undead mages, Rachel and Natasha were going around destroying the fortified scaling towers. At first, they tried to kill the ogre kings as well, but that proved difficult. Taking down one ogre king required too much time, which gave the other ogre kings a chance to reach the walls. So the best strategy, for now, was to destroy the fortified scaling towers while ignoring the ogre kings. 

...

As the two holy maidens were doing there best, Galius was watching the whole situation from the walls, and based on his understanding on how strong each individual present was, he concluded that as long as the elder lich or any of the two undead dragons don't make a move, then they would probably last for three days at most. If someone among the three were to attack then, everyone in Grenton will die after Valdel and Lara fall from battle. 

The only chance for survival now was if the reinforcements from the capital miraculously arrive early, or if either Ren or Nezzard join the battle. It was also possible that with some insane amount of luck, a powerful entity appears to help them. 

All of these options were things that he couldn't control which frustrated Galius. 'If I knew this would happen, I wouldn't have sent those saint level swordsmen back to the capital.' Galius regretted his decisions that lessened Grenton's fighting force. Still, this was no time to regret anything all he could do now is try his very best to lead his troops and survive for as long as possible. Who knows a miracle might happen. 

...

Hilda who was now deeper inside the enemy formation had lost a large portion of adventurers. As the adventurers died, Hilda and those that were left would immediately incinerate their bodies before they're turned into undead. Also even though they lost a lot of adventurers, Hilda and the others were still able to destroy a majority of the undead mages. Now that her mission was complete she wanted to retreat, but unfortunately, their escape route was blocked by the swarm of undead. 

"Everyone we need to break through the enemy ranks to get back to the wall! If you want to live stay in formation and destroy any undead in front of you! We need to retreat back to the wall!"

As Hilda shouted this she was attacking an undead warrior in front of her. She must've killed hundreds by now, but their numbers don't seem to be dwindling. Hilda and the other adventurers were starting to feel their bodies becoming sluggish as they were utterly exhausted. 

At they were trying to break through some of them got killed by stray spells. The battlefield was getting even more chaotic, and this was a disadvantage for the human side. 

The only ones left in Hilda's group were a bunch of B ranked adventurers. Yet even with their superior skill, they were already breathing heavily from exhaustion. If this keeps up they will surely die in the middle of the swarms of undead. 

Hilda who was smashing another undead was late to react as one of the enemy undead was able to stab a sword onto her shoulder. 

'This doesn't look good... Am I really going to die here?' As she was feeling a bit of despair, Hilda suddenly heard the clip-clopping of horses. 'Damn it, are Dullahans here!' As she thought of this, Hilda who was expecting headless horsemen sweeping through the battlefield was instead greeted by a better sight. 

It was human riders and they were raising a flag with the coat of arms that was a spear piercing through a dragon. Hilda was familiar with this coat of arms, this belonged to the powerful Regalcrags. A fallen noble family full of warriors. 

...

In front of the cavalry was a man wearing full plated armor holding a spear. This was none other than Stephan Regalcrag. He and his family swept through the undead warriors destroying all they pass. The proud warriors of the Regalcrags laughed as their blood boils, knowing that this was a battle worthy to signal their rise back to power. Even if they do die, they won't die as disgraced fallen nobles, they would die as a proud warrior family. 

Stephan was practically crying as he smashed another undead's body. 'Finally a chance to redeem our honor! I will not be the sinner that led the family to eternal shame!' 

"My men, my brothers! Show this undead swarm the might of the Regalcrags! Show them the fierce might of true warriors! Show them our strength so the bards my sing praises of our valiant charge!"

After shouting this, Stephan led his men to once again charge into the army of the undead.

...

Lara who was watching at the walls showed a slight smile. 'So they finally made their decision. I now see why Ren wanted them as his subordinates if they're able to survive this ordeal they might become a sharp blade for Ren to use.'

...

'So they now have a cavalry, let's see if their cavalry can match up with mine..' The Elder Lich then ordered the Dullahan to begin their charge.