DEM Laboratory:
Agonizing scream filled the whole room as Ellen is lying naked on the experimental bed with tubes, hoses, and wires are all connected on her body. DEM's top scientists are handling many robotic and medical equipments that surrounds the wounded wizard with Westcott just watching in the background while his arms are crossed.
Westcott glanced at the robotic pedestal with a levitating silver katana over it.
"I'm surprised that it didn't lose its powers after its master's death." Westcott smiled mischievously. "This will be a perfect replacement for Zadkiel."
His attention turned to his loyal wizard when Ellen screamed again after one of the scientist inserted a long needle in the vein of her left wrist. Ellen started wheezing and gasping when the scientist filled her with mixed of demon and human blood that was inside of the fat syringe.
"You served me well Ellen. For all these years you've been so loyal to me. Now, I'm giving you the reward that you deserve." Wescott said in a calm and proud tone. 
He is trying to hide the pleasure he is feeling from the great pain and suffering that the world's strongest wizard is experiencing.
Inside Ellen's mind she asked herself in regret. "What have I gotten myself into?"
Ratatoskr's infirmary:
"Don't lose hope!"
"There's too many of them!"
Shouting, screaming, and blast of assault rifles are echoing behind the sealed metal sliding door of the infirmary. Shido, Elliot, an unconscious Kotori, and the blonde girl wearing a glasses behind Elliot named Karen are all trapped like rats inside with two armed soldier protecting them.
"What's going on?!" Shido demanded.
A sound of a man's agonizing scream while he is getting gutted out was heard outside.
"Damn you Westcott!" Elliot cursed under his breath while he rubbed his temple.
All the sound of crying, screaming, and flesh getting ripped apart went silent and got replaced by... 
*BOOM! BOOM! *
Swarm after swarm of demons are outside, trying to break in. The demons are pummeling the metal door using their heads worse than some rabid animal. Once one oni killed himself by destroying its own head, another oni will replace it. 
"We got no choice but to fight!" Shido exclaimed as a dent formed on the metal door.
"Sandalphone!" Shido called out Tohka's angel and a broadsword appeared in his right hand.
Suddenly, the large dent of the door turned into a hole and the swarm of demons on the other side all pushed themselves inside like ants exiting out of their nest.
With a war cry, Shido unleashed a powerful purple blade energy that neutralized the first wave of the swarm. But like a wave of water, they just keep entering the infirmary non-stop. Shido got surprised by the bright flash beside him, he glanced at the one who is behind it and saw Karen standing there with a wingsuit and two swords similar to Ellen.
"Never thought I would be wearing this suit again." Karen said.
She and Ellen are wizards during their time, but after Elliot abandoned DEM she went with him and be his protector. DEM's history, she surpassed her sister by intelligence and power. And also, both sisters have a calming personality, however Karen is a lot tamer.
Tengu City:
"It's so dark, are we heading the right way?" Yoshino asked.
"I don't know, I guess we'll get there eventually." Natsumi replied with a sigh and a bored look.
"What the hell?!" The giant rabbit, Yoshinon suddenly cried out when a large skeletal hand almost grab them in mid-air. 
They thought they are flying over the buildings, that's when they realized they aren't high enough to avoid some of the building walls and there's a gigantic creature that can reach them. They all crashed on a window and ended up inside an office full of desks and computers, destroying them and sending all the paper works flying. 
Tohka, Origami, Yuzuru, and Kaguya got knocked out cold on the tiled floor after bumping their head on the floor. Yoshino and Natsumi shakingly stood up as they rubbed their head.
Yoshino's giant rabbit turned back into a puppet on her left hand. When she saw the others, she immediately run towards them and shake them to wake them up but they didn't respond. She looks over Natsumi and her eyes went wide when she went eye to eye with the giant creature that is peeking outside the broken windows. 
It's a skeleton staring at them with its red glowing eye sockets. The giant skeleton force its bony hand inside the building, destroying the concrete wall that's acting as a support for the windows. When it almost reached Natsumi who is trembling and too shock to move, Yoshino quickly acted by summoning an icy spike beneath the giant hand forcing it to fly over the upper section of the building and get stuck there.
But the skeleton just effortlessly took out its hand as cement and dust fell. It's eyes glowed bright red, signaling the two spirits that they angered it. It clenched its other hand into a fist before cocking its arm.
"Natsumi get out of there!" Yoshino cries out, making her friend to snap out of it and run towards her.
Yoshino quickly summoned a thick wall of ice, hoping it is enough to protect herself and her friends. She and Natsumi hold their breath and hold their ground for the blow that they're going to receive.
Before the skeleton could unleashed a powerful punch that could destroy the building in half, something or someone kick it on the left side of its temple, sending it sliding through the street before crashing into another building. The impact made the building crumbled into a huge chunks of concrete and rocks, burying half of the skeleton's body under the heavy rubbles.
Waiting for the blow, Yoshino and Natsumi got puzzled when the incoming assault didn't occurred.
"W-What happened?" Natsumi shakingly asked. Both she and Yoshino can feel their heart pounding really rapidly inside their rib cage.
Yoshino made a peeking hole on the ice wall and when she took a quick look, she saw no giant skeleton staring back at them or attacking them. 
"Where is it?" Yoshino mumbled.
"Well, wherever it is we need to get the hell out of here!" Yoshinon demanded.
Outside the building, Dante landed on his feet after striking the towering demon and send it hurling like some gigantic ragdoll.
He smirked and dust off his hands.
Suddenly, all the rubbles flew to the air and the area of the impact zone got covered with thick dust cloud. And inside the dust, two glowing red eyes appeared looking at him before fading away slowly.
Without warning, an invisible force wrecked the devil hunter with a brutal blow, burying him six feet deep in the crater. The source of the destructive assault slowly appeared itself, revealing its bony fist over the wide crater. Suddenly, a bright red light flashed under the skeleton's fist and the hand begins to get lifted. Beneath it, Dante in his semi demon form is overpowering the brute strength of this monstrous skeleton.
This cause the skeleton to get irritated. It took its massive fist out of Dante's grip and it pummeled the devil hunter with it once more, but Dante caught it and it created a shockwave.
"You need to try a lot harder than that!" Dante said and grunted with a demonic voice.
The skeleton again raised its fist, but this time it tries to crush Dante with both of his clenched fist. The Demon hunter immediately summoned his devil sword and he slashed upwards against the demon's assault.
*Slash! *
Both hands of the skeleton falls to the ground with a ground shaking thud. The skeleton looks at its handless arms in confusion.
"For being a gigantic halloween decoration, you sure are quiet." Dante chuckled with his normal voice while standing on top of the skeleton's head back to his human form again.
Unfortunately, he felt a sharp pain on his back and to his abdomen. He glanced down, and saw a neon blade piercing him.
"It's nice meeting you again, newcomer."
A girl's voice behind him suddenly spoke, making him smirk.
"This is getting really interesting."