A/N: Oh my glob, so many stories. I had this idea, and I just couldn't not write this. And while I know that there are already several BloodBorne/RWBY crossovers, they were all: Hunter gets transported to Beacon, stuff happens. And while that isn't a bad thing, I decided to write this. Rather than being a BloodBorne character in RWBY, I decided to make something new. So, as I can't do a review thing, because this is the first chapter, I'm going to make this a short A/N. Fav, follow, and review if you want to, because they definitely motivate me, and stay Jammy.

Peace.

Chapter 1: Taint.

Ruby ran through the woods, snowy trees flying past as she sprinted down the deserted path. A bestial roar screamed through the night, only leading her to run faster. Snow crunched under her boots as she hurtled through the night. Soon, she'd be at her house, safe. Or, she hoped. Her mother could help her, she used to be a soldier, she could stop whatever was chasing her. Those were the thoughts that flew through her mind, as her house came into view. Her mother would be inside, cooking dinner, Yang in her room, punching that old, sheepskin bag full of sand her father had given her. She had her gauntlets, and mother her sword, all ways kept atop the mantle piece. Ruby took a glance back, and saw that she was leaving the beast behind her in the dust. It was massive, the size of one of the carriages shed sometimes seen, when she'd had to go into the big city with her mother. It was covered in lank, patchy fur, soaked with melted snow, and caked in red. She'd been walking through the forest, looking for some berry's, to go with today's meal, when she'd come across it, gorging itself on the body of a man, dressed in a hood, trousers, and a white shirt, a pistol laying discarded by his body, and an axe embedded in a tree across the clearing. It had chewed for a few seconds, before it had noticed her watching it in horrified fascination. At that point, it had leapt towards her, initiating the chase, that had gone all the way from that clearing all the way to her house. It was a small cottage, quite a way from the big city. Her mother had worked there for a while, having Ruby while she was working there, to a guardsman named Tai-Yang, who came by to see them every now and then. He'd already had Yang by another woman, who'd left soon after she'd had Yang, leaving him with the girl. Ruby's mother, Summer, had parted from him on good terms, after she'd given birth to Ruby. She'd decided that with two girls to look after, that she couldn't keep up with the constant demands of being a member of the watch. She'd left for the country side, taking her daughters with her, and set up the small cottage in the woods, eking out a full, if simple life in the country, far from what could be objectively called "civilization".

Damn it Ruby, now is not the time to start contemplating your life. Run!

She sped up, reaching the cottage a good way ahead of the wolf, throwing herself against the door, screaming for her mother. Summer opened the door, concern spread across her face, before spotting the beast barreling out of the tree line. With out a word, she dashed back inside, coming out again, holding her city watch sword in an iron grip. She pushed Ruby inside, shouting:

"Yang! Keep her inside!"

Before she ran off to face the beast. Ruby tried to follow her, before strong hands wrapped around her from behind, holding her back. She craned her neck, looking up to see Yang's face, crinkled with worry.

"Don't worry Rubes. I'm sure Summer's got this..."

Ruby could hear the uncertainty in her voice, as Summer stepped towards the monster, blade at the ready. The wolf regarded her for a second, before snarling, hurling itself forward. Summer still had her old instincts though, and ducked past its leap, slashing at it's side with her sword. The blade cut deep, blood spilling down its leg and dripping to the floor. It gave and injured cry, turning and launching it's second attack. It slashed out with both sets of claws, causing Summer to back up, to avoid the swinging blades. She wasn't entirely successful, a claw cutting across her simple shirt, carving a shallow cut into her chest. She winced, before slashing back, catching it across the stomach with another strike.

And that's when it all went wrong.

The wolf swung a massive paw, Summer raising her blade to block, and managing to stop the blow. The force of it, however, was enough to spin her around, so she was facing away from the wolf. Her eyes met those of her daughter for a split second, before the claws came down again, carving through her back. There was a spray of crimson, and she fell face first to the ground. The wolf gave a victorious howl, before leaping, Summer turning on her back just before it landed, raising the sword high, in one futile act of defiance. There was a sickening crunch, and the wolf went still.

"Mom!"

Ruby tore out of Yang's arms, flying forward, and dropping to her knees next to the bodies. She reached out to them. Suddenly, Summer gave a pained groan, as the wolf shifted atop her, lashing out with its final breath, and closing it's teeth around her outstretched arm. Ruby screamed, before there was a small crunch from beneath the wolf, as Summer twisted the blade. It went still, and Yang pushed the beast off, laying it's limp body on the ground, before turning back to Ruby, reaching up and pulling the scarf from around her own neck, and wrapping it around the ragged wound, as Ruby screamed into the night. Yang held her close, until she stopped screaming, her fragile body racked with sobs. Summer groaned again, and the two of them leaned over her, their knees soaked by the expanding circle of red.

"Mom!"

"Summer!"

Summer looked at them, with a face full of pain and sorrow.

"Ruby...It bit you..."

"What?...Yeah, it did, but, Mom, you're hurt! We need to get you help!"

"Ruby...It's too late for that...It cut too deep. I won't be around for much longer...It bit you. You're infected"

Tears streamed down Ruby's face.

"What do you mean?"

"You're infected by the same disease that made that thing what it is. We got reports of it, back when I was a guard. If you don't find a cure..."

Ruby watched, as her mother reached into the pocket of her trousers, wincing as she did so. She pulled out of the pocket, a map.

"The place marked on this map...Is the source of the infection. It houses someone who can cure you-"

"No! I'm not leaving you here to die!"

"You have to! I'm already dead. Yang, take Ruby. You know where I keep the money. There'll be enough there to get you two to Yharnam. Find the doctor. You're a strong girl Yang. I need you to look after Ruby for me"

"Summer-"

"No. I need you Yang. Take Ruby to Yharnam. Find the doctor. Cure her. I'm counting on you"

Yang nodded, though teary eyes.

"Yes. I'll take Ruby. You can trust me"

"I know I can"

Ruby clasped her mother's hand with both of her own.

"But...What about you..."

"Just...Go with Yang. You'll need to look after her too. Make sure she doesn't do anything silly. I'm counting on you too"

Ruby tightened her grip for a second, before nodding, and letting go, eyes shining with tears. Summer smiled one last time, brushed her hand along the side of her daughters face, and let out her final breath. She lay back on the snow covered earth, wet with her blood, and the tears of her daughters, and closed her eyes. Ruby sat in Yang's arms, and wept.

That night, Yang buried her body, and burnt the corpse of the beast, performing both tasks with a grim determination. Yang gathered the not un-substantial amount of money Summer had accumulated in her time as a member of the watch, loaded some food into the saddle packs of the family's tired old donkey, slid Summer's blade into the holster on the saddle, and rode off into the distance, Ruby sitting behind her, arms locked around Yang's waist, in an emotional rigor-mortis. Their destination?

Yharnam.

And the cure for a sickness. One of the body, and of the heart.