Dark Souls x Claymore crossover

Disclaimer: I own nothing but the story

Prologue

The wind blew silently through the forest as a lone figure made its way towards a dilapidated arena. The click clak of armor on stone soon followed as the figure wound its way through the halls of the remnants of the once powerful Kingdom of Oolacile. Brown rock that had at one point in time been marble was now cracked and hewn from the ravages of time, nature and the countless battles that had once taken place in this vast colosseum.

That silence was soon disturbed by the clik clak of armor, a sound not heard in centuries. A lone female knight entered the arena, her armor resplendent despite the wear and tear it had endured over countless battles. The fabric while faded still proudly presented it's light blue colors to the enemy and to the she entered the arena a lone Bloat-head was standing across from her, its head shaking from its silent cackling. Just as the creature of the abyss was about to attack however, a shrill inhuman cry rang out from the outside of the arena. The Bloat-head looked around as if in abject terror before running away towards the other end of the arena.

It never made it. In a blur of worn royal dark blue, a large figure impaled the creature on a greatsword of impressive size. Armor, once a silver that shone proudly in the sun, now marred by black blood, and rent by a titanic struggle. Dark royal blue fabric that was ripped, worn and covered in black blood to the point that it almost wasn't blue anymore. Before her stood the once proud and vigilant Artorias, one of Lord Gwyn's Four knights, and hailed throughout Lordran as the Abysswalker. The knight while still a hulking giant, was hunched over holding the greatsword in his right hand, the Bloat-head still impaled on it.

As the Chosen Undead stepped forward to challenge the now corrupted knight, he unleashed another inhumane howl before swinging his greatsword and sending the body of the impaled bloat-head towards her, which she easily dodged. However some remnant of Artorias was still fighting in the subconcious part of his mind.
While he desperately tried to warn the newcomer none of his words would be heard, Manus would not have it, not while this interloper held his precious necklace.

"Whatever thou art, stay away!" he desperately cried in vain on the fringes of what little remained of his humanity. "Soon... I will be consumed... by them, by the Dark."
he again tried to no avail. Crouching low Artorias then jumped and brought down his greatsword making the ground tremble. The knight had rolled to the side with great speed and agility despite the heavy armor she was wearing. Holding her crouched position she swung her Silver Knight's Sword and caught him across the torso. Artorias showed no physical reaction to the blow, which would have crippled most foes, possibly have cut them in half.

Artorias simply released another howl before raising his greatsword and bringing it down again in an overhand smash. Rolling to the side again she backed up putting some space between her and the corrupted knight. His response was to charge her swinging his greatsword in a low arcing circle. Most people would have dodged jumped back, instead she crouched low moved towards Artorias and raised her shield over her head. His sword swung over her shield and briefly connected with the shield sending sparks flying into the air. Twisting around till she was behind him she delivered three swift blows to his back. Realeasing another rage filled howl Artorias turned and thrust his sword forward with inhumane strength, he missed by a hair however as she jumped to the side.

"Rrrreuuuuuuggghhhhhhh!" Artorias cried in pain both physically and mentally, Manus was pouring more power into Artorias trying to completely take over his mind.
Artorias (largely thanks to his iron will) held out and endured the pain of the Father of the Abyss's rage. Manus however deep beneath his former prison was furious, while Artorias was a powerful foe, against the master and creator of the dark flame his power was nothing. Yet here a lone warrior was besting one his most powerful corrupted warriors. He didn't consider the people of Oolacile to be that strong and gladly threw them in the warrior's way. What was infuriating to Manus was that he could sense his necklace with this undead.

"End her! End her now and bring me my necklace Artorias, I command thee!" the Father of the Abyss cried in rage, and disappointment. Manus' voice while powerful and deep held little power over the knight, for only one man could command him and that man had left for the Kiln of the First Flame ages ago. Artorias continued to resist with as much might as he could muster. "Thou art strong human, surely thine kind are more than Dark." "I beg of thee, the spread of the Abyss... must be stopped."

In the physical realm the female knight was reaching her limit and would need to end this soon. A shroud of darkness began to surround Artorias and throwing his broken arm forward releasing a black purplish sludge that crashed on the ground near her. Taking a few cautionary steps back she then noticed him crouched down. Jumping up and preforming a somersault and slamming his sword down where she had been. The sword dug deep into the cracked marble of the arena, and the knight barely had enought time to dodge the next two somersaulting blows.

However after the last blow she tripped over a stray piece of rubble. In actuality this saved her life as Artorias swung horizontally in the hopes of killing her. Flipping his sword so he was holding it with the blade facing downward Artorias sent the sword down with all his remaining might. At the same time, through sheer will and desperation to defeat this enemy, the chosen undead grabbed her sword in both hands and charged with her remaining strength. His greatsword ended embedded in the cracked marble, her sword impaled through his armor and his heart.

Artorias screamed in sheer agony as the darkness inside his body rushed out through the mortal wound. After the last of it finally left his body his weight began to overpower the victorious warrior. Moving out from under his collapsing body she saw the face of her unwilling opponent. His hair was black and matted in many places, most likely from fighting the forces of the abyss for so long. His face was young, almost as if the gods themselves had chiseled it from the finest marble.
His eyes were a piercing sky blue that shone defiantly in the setting sun of Oolacile reflecting his legendary iron will.

"Thank you fellow warrior... for ending my pain." Artorias began (had there been any fair maidens (or fangirls) they would have promptly fainted from loss of blood)
for his voice sounded as if it were carried by the wind. "I despise having to do so, but I must ask thee to complete" Artorias was briefly cut off as a fit of coughing overcame him, "my mission." he continued in a strained manner and clearly wincing from the pain of talking. "The...spread...of..the...abyss." At this point the warrior held up a single hand to silence him. Artorias could only stare as the warrior reached up and removed her helm. Had he any breathe left he was sure he would have been gaping in awe. Platinum blonde hair lined a face that felt as if it was created by angels and was made of the purest ivory.

Her eyes were pure silver and held a melancholic sadness in them. Artorias wasn't sure as to whether he was dead or dreaming (the pain reasurred him that he was very much alive if not slowly dying) because when the setting sun was directly behind her he could have sworn that he saw wings of the purest white from her back.
"Do not worry Artorias." she said and her voice could very well have been confused for that of one made by an angel. "I will carry out your mission and slay the monster behind this darkness," reaching for her sword (which she had removed some time ago) she held it up in front of her face. "I Teresa of the Faint Smile hereby declare that I will finish this mission in your stead." Artorias smiled "Thank you...Lady...Teresa." he said. As she turned to leave she heard his last dying words. "Ah, Sif! There you are! All of you...forgive me...for I have availed you nothing." He solemnly said.

With that Teresa of the Faint Smile pressed on determined more than ever to end this nightmare.

Some time later Chasm of the Abyss

Teresa had fought her way through the labyrinth that was the Oolacile prison eventually arriving at Manus' former cell. Having smashed the wall she had arrived at the top of the chasm (which, she added, had been aptly named) in the distance she could easily see multiple red eyes staring disconcertingly at her position. "That must be Manus." she said to herself mentally. On her way down she was confronted with a new foe. These were similar to the humanities that she had been collecting and while they were quite weak the problem was that there were so many. To that end she had resorted to using her more powerful pyromancy spells to destroy larger groupings. Near the bottom of the abyss however she stopped in her tracks. A faint howling could be heard but only for those with the keenest of hearing. But this was no ordinary howl, this was the howl of a wolf.

Looking around she noted a particularly suspiscous pillar. Striking it immediately dissolved the illusion, and upon making her way forward she found an interesting sight. A small group of phantoms were trying to attack a fairly large grey wolf, this wolf was protected however by a large shield casting a protective aura around the wolf. She immediately went into action swiftly striking down all of the phantoms in the vicinity.

After the last one vanished after being slayed she turned to the wolf and then knelt beside it. Reaching out her hand, the wolf give a cautious sniff before she let her pet her and scratch behind her left ear. The wolf then gave a mournful howl before vanishing into the river of time and space. Teresa gave a small sigh, then steeled herself for the coming battle and set off with renewed vigor.