Where is Xanriel in all of this? Excluding Jonathan (who is unavailable), he's probably the strongest guy we have.
While his friends and allies were fighting for their lives, Jonathan was locked in a deadly combat with his uncle Mavros. Mavros was wielding a long saber of gray bone, a sickly green venom oozing constantly from the blade. Arsenic, Jonathan thought. Morte had given Mavros the pestilent blade of Death, and indeed it was an even match with his own Vampire Gladius.
Jonathan hated to admit it, but even in his demonic form he was not going to defeat his uncle. I'll have to take True Form, Jonathan thought.
"Where is your power now, eh boy?" Mavros sneered and taunted. "
Life Sever!"
"
Soul Harvest!" Jonathan responded with his own attack. Waves of darkness and pestilence crashed into each other, decimating all that is near them. Immediately after the blast had dissipated, Jonathan lunged at Mavros with renewed vigor. Mavros parried that attack, and continued to trade blow after blow with Jonathan.
"It's useless, dear Nephew! You cannot defeat me like this!" Mavros said after blocking a vicious strike that was meant to end his life. "Why don't you take your supposed True Form, boy?"
"You don't
deserve to see my True Form, traitor." Jonathan spat at Mavros's face.
Mavros smiled maliciously. "Then, dear Nephew, I shall
make you take True Form." He thrust Jonathan aside with a wave of poison, and leapt away.
It took Jonathan a second before he realized where Mavros was heading to. His beloved Nyxia was concentrating all of her attention on blasting the undead to bits, and she was glowing with power like a dark goddess of the night. Mavros and his pestilent bone sword was aimed straight at her back. Jonathan's stomach twisted in a knot as horror filled him. "NYX!!!" He shouted.
But of course, Nyxia was not a pushover. Turning around gracefully, she shot forth a bolt of darkness straight at Mavros's face. Cursing loudly, Mavros swerved to the side, narrowly dodging the blast. He leapt away as Nyxia launched more bolts of darkness at him.
Jonathan rushed to Nyxia's side. "Nyx, are you all right?" His stomach was still sick with dread, afraid that Nyxia might have been infected by the deadly poisons of Arsenic.
"I'm fine, John." Nyxia smiled reassuringly at Jonathan.
Raw and unparalleled hatred and fury swept through Jonathan's mind. "You tried to hurt Nyx. Traitor, I'll make you wish that you had never been born!" He all but bellowed at Mavros.
"Finally angry enough to take True Form, eh?" Mavros continued to taunt Jonathan. "Bring it."
Jonathan turned to Nyxia, his face grave. "Nyx, get everyone out of here quickly. I don't want them to become collateral damage."
"John..." Nyxia's beautiful dark eyes were filled with concern and worry. "All right," she said. "Avenge your parents, John." She quickly kissed Jonathan on the lips before the leapt away with a burst of darkness.
"Now, Mavros..." Jonathan said in an almost bestial snarl, and his blood-red eyes began to glow. "
Prepare to face the worst nightmare of your life!"
Even though he didn't want to show it, Mavros tensed. He was anxious to see what sort of deadly beast frightened even Phaeus Shade, the great demon archlord.
"
吞天納地,魔渡眾生。天下萬物,唯我至尊。" Jonathan murmured an obscure, archaic chant. "
原身——噬血魔龍!!!"
Mavros watched Jonathan in morbid fascination. Raising his sword high above his head and pointing straight at the sky, the blade burst into sanguine flames. Then, the flame spread, slowly covering Jonathan's body starting from his arms, to his body and legs, then to his wings, and finally to the tip of his long sinuous tail. Jonathan's entire body became a roiling mass of darkness and red flames, streaked with black lightning.
But it was not over yet. Far from it. Like a serpent, Jonathan's tail twined around his own body. He spread his large draconian wings, spanning an entire twenty feet, and then abruptly closed them in on himself. When the wings covered his own body like a sphere, they melted and compressed into himself. Jonathan now resembled a human-sized sphere of pure darkness.
Then, the true horrifying transformation began. The ball of roiling and squirming darkness that had been Jonathan twisted violently, then it expanded and stretched into the sky. Mavros watched in shock as Jonathan elongated himself, until he was even larger and longer than the titanic demon that Mavros had summoned earlier.
Then, the coating of darkness and red flames began to fade away. A pair of gigantic black draconian wings burst out of the colossal creature's back, almost obscuring the entire sky. Black limbs and claws sprouted out of the dragon's long serpentine body, claws that were designed to rake and tear. The creature's entire body was covered by obsidian scales, from head to tail which ended in a long, vicious spike. The dragon's head was decorated by two long sharp horns pointing backwards, and one long, blade-like horn pointing forward that protruded from his forehead. The dragon opened its massive jaws, revealing a mouthful of blood-sucking fangs that could easily rend the tiny Mavros to shreds.
The dragon opened its eyes. The sclera was still pitch-black, but the irises were cold. Primal. Predatory. They were as red as freshly-spilled blood, and the patterns of the Mark of Darkness could be seen faintly within them. Those eyes met Mavros's dark, abyssal ones, and Mavros felt a terrible shiver of dread run down his spine. The dragon roared, a primordial and terrifying sound that seemed to echo within every corner of darkness.
"I am darkness. I am everywhere. I am Bloodshadow."Mavros's eyes widened in terror, as tentacles of darkness that seemed to sprout out of literally every shadow-filled corner seized him, restricting his movements. Jonathan, no, Bloodshadow, looked at Mavros with its Eyes of Darkness. Streaks of dark energy began charging in its jaws.
"Die, traitor."
Editing in progress. Do not ninja.
EDIT: Brace yourselves, adventurers! The dragon on steroids is coming! DUN DUN DUUUUUUUNNNNNN!
Still not finished, though.
EDIT 2: OK, it's finished. I've just spontaneously decided to give Jonathan some sort of split-personality when he takes True Form. And that split-personality is named Bloodshadow

If I godmod, I godmod with style.
But don't let Mavros die just yet. He is probably going to escape, because we're not even at the false vampire arc yet! Maybe Morte is going to come personally and rescue him, and they'll face Mavros again when they're at the Dead Marshes.