Disclaimer: I don't own the characters from Buffy the Vampire Slayer or Shadowhunters/The Mortal Instruments they belong to their respective creators. I do own the character Agatha Wayland.
Authors note: For the purpose of this story – the characters from Buffy & Shadowhunters are the same age, so this will be AU to an extent. Also I know no spells or anything like that so whatever you see is made up unless otherwise stated ie used from something like Charmed.
The World Is Black
Agatha Wayland and Magnus Bane sat in the middle of Magnus' New York apartment they were talking about how they might be able to track Valentine Morgenstern down. Jace Wayland, Isabelle & Alec Lightwood, Simon Lewis, Clary Fray and Luke Garroway paced back and forth behind them throwing suggestions to them that they thought might be helpful in tracking him.
"What about..." Jace trailed off being silenced by Agatha who shook her head.
"No, that won't work," Agatha told him not letting him continue talking. "Using a pendulum won't do it, it's not strong enough,"
"Will candles work?" Isabelle questioned, looking at Agatha as she spoke – hoping that her parabatai would like her suggestion.
"Possibly," Magnus and Agatha both replied at the same time as they allowed their eyes to flash to their cat state.
"What do you mean possibly?" Luke queried running a hand over his face.
"Possibly as in it might help, and it might not help," Magnus spoke this time, he knew that somehow Agatha had something in mind.
"Aggie, what is it?" Alec asked crouching down beside his best-friend.
"Nothing, just a feeling," Agatha said, taking a deep breath before she spoke again. "I can't help but feel that there is more than just Valentine out there. And before you ask I can't use the spell that I use on you when I want you it's not that simple,"
Alec wrapped an arm around Agatha watching as he could see the older girls eyes searching for something. Alec looked at Magnus, his eyes settling on the older man's own eyes when he realised that he was being stared at. Agatha suddenly grinned when she realised what she could do.
"Clary, you're linked to him – I know that you don't like that thought but you are. Do you think that you could sketch him for me, from what you've seen?" Agatha questioned as she set about placing some candles around the room and putting Magnus' cauldron on the floor.
"I don't think I'm going to like where this is going," Simon said he was the most nervous vampire that they had met.
"Oh Simon, there is going to be a lot of things that you don't like," Agatha laughed, grinning as she moved the candles around with out taking her eyes of Simon. "Magnus, do you have any amethyst power lying around?"
"No, you're not doing that one," Magnus told her shaking his head.
"Relax, I just wanted to see your reaction. All we need is the photo, a drop of Clary's blood and to say this," Agatha answered as she scribbled some words down in Latin while Clary sketched out a picture of Valentine. 'Ubicumque Valentino per aethera cursum videbantur Ostende nobis situm movere sanguinem trans map' (Wherever there is Valentine, course unseen through the skies, Show us the location, move the blood across the map) "Oh and we need a map of the world too!"
Magnus motioned towards one of his many bookshelves thinking that what he had over there would help. Luke walked over to the bookshelf and shook his head there was nothing there that could help them. Agatha rolled her eyes and pointed to the globe sitting by the window.
Meanwhile in Sunnydale, California at the local highschool, Buffy Summers sat in the library talking with her former Watcher Rupert Giles and her current watcher Wesley Wyndam-Price. They didn't know what was coming – well their 'bigbad' for the year was the Mayor – they had no idea about the larger picture.
"There has to be something that we can do about the mayor's ascension?" Willow Rosenberg questioned, looking at Buffy as she spoke and then at her boyfriend Ox.
"Not unless you learned anymore from those books?" Giles answered, looking up from the pages that Willow had produced for him.
"I didn't," Willow bit her lip as she spoke.
"Will, don't be discouraged," Buffy said glancing at her best-friend as they all suddenly turned towards the door as they had heard a noise behind them.
Agatha's location spell had given them the location of Sunnydale High as where Valentine was – so Agatha and Magnus had opened up a portal and sent their friends there. They would join them shortly, she had warned them to be careful as they didn't know what would be in Sunnydale.
"Izzy, be careful please," Agatha hugged her parabatai tightly before moving to the others. "Alexander, look after your sister and Jace you take care of Clary," Simon and Luke looked at one other Simon wanting to know if she was going to tell him to do anything.
"Don't worry Agatha, I will look after them all, you hurry behind us though," Luke told her with a smile before the group headed through the portal with Alec looking behind them.
"Go, we'll be there soon enough need to make sure that my lair stays protected," Magnus told him, even though he knew that Alec was looking at Agatha for her word. "She'll be there,"
No sooner had Clary, Jace, Alec, Isabelle, Simon and Luke walked through the portal and into the corridors of Sunnydale High were they attacked by Buffy and her friends, Alec being staked in the shoulder narrowly missing his heart. Clary screamed when she saw the blood, Jace moved to go and heal his parabatai but had Buffy stand in front of him stopping him from moving. Isabelle yelled for Agatha to hurry up.
"Aggie! We need your help now!" Isabelle yelled, hoping that Agatha could hear her even though she was on the other side of the country. "Big bro, hold on I'm sure Aggie will be here soon," within seconds of Isabelle yelling another portal opened and both Agatha and Magnus stepped through to stop everyone from fighting. "Aggie, can you help Alec?"
"Who are you people?" Giles questioned, watching as Magnus and Agatha effortlessly avoided being hit by Buffy and Angel.
"Nephilim," was the only answer that Jace gave them as he pulled his stele out and quickly activated his glamour rune.
"Nephilim?" this time it was Wesley who spoke.
"Yes, nephilim. We're Shadowhunters, we kill demons make friends with vampires and werewolves," Agatha said before crouching down beside Alec and talking to Jace at the same time. "Jace de-glamour now. Alec, this is going to hurt..."
"Aggie, just hurry it already hurts like a bitch," Alec muttered, passing out from the pain and the slight loss of blood.
"What exactly are nephilim?" Giles questioned, they were all curious as to what the people before them were.
"Rupert Giles, you've met one before, I can tell," Agatha said closing her eyes and letting her warlock side take over. "Jace, he needs an iratze now," Agatha's hand began to flicker purple as she started to heal Alec. "Can this wait like 5 minutes?" as Agatha and Jace worked on healing Alec, everyone resumed their fighting – causing Agatha to yell. "Enough!" making them all freeze on the spot.
"Aggie, how is he?" Isabelle asked, glancing at her brother and then at Oz who's arm she had a tight grip. "Would you please stop trying to hurt me?"
"Sorry," Oz put his hand down, and looked at Clary and Willow who were face to face neither girl wanting to hurt the other. Luke and Angel where face to face both men showing the darker side of their being. Simon and Xander were mid-slapping each other.
"Can we all agree to not kill each other?" Clary asked as Alec was healed enough to sit up without losing consciousness again.
Jace and Agatha stood up and moved Alec to one of the chairs so that Jace could work more on the healing iratze. Magnus smiled at his little sister watching as she diplomatically had everyone move back to the tables and not at each others throats. The Shadowhunters on one side of the table and the 'Scoobie Gang' on the other side.
"Now, will you tell us..." Giles trailed off being interrupted by Agatha.
"Nephilim, simply put are the children of the angel Raziel. We are born with the blood of the angel, we have been training to fight since we were children. There are those among us who are more talented than others. In this room right now you have one of them," Agatha spoke trying to think of the best way to explain everything. "To the mundane we may seem immortal, but we're not we have vulnerabilities just like everyone else,"
"What my sister is trying to say is that you caught Alec by surprise, all of us really. If you hadn't hurt Alec it could have been a lot worse," Isabelle said, she knew that it was what Agatha was trying to say to them. "What are you?" she looked at Buffy as she spoke this time. "We haven't seen a mundane move that fast ever,"
"Vampire Slayer," Buffy said, Simon stepped back towards Clary who grabbed hold of his arm preventing him from moving.
"Vampire Slayer," Agatha repeated as both her and Magnus closed their eyes searching the memory banks for any mentions of Slayers.
"Got it, you do what they do, only you are chosen – activated," Magnus said, looking at the young girl before him. "But what about the rest of you?"
"Werewolf," came Oz's reply, Luke looked at him he wasn't like the werewolves in New York.
"Tall one over there is a vampire," Luke said pointing to Angel as he did so, and then looked at Xander and Willow. "This pair, I'm not sure about. The boy can't fight,"
"Luke! The girl seems to have a large interest in witchcraft, I keep seeing pencils levitating and moving towards us," Agatha laughed, making the pencils drop with a flick of her wrist. "Sorry, forgot to mention that I'm half warlock, half nephilim...and Magnus is the high Warlock of New York,"
Magnus bowed at the mention of being the High Warlock of New York, what self-respecting warlock wouldn't? Magnus enjoyed when Agatha announced who he was, but not so much when other people did.
"Alec and Isabelle Lightwood, Jace Wayland, Clary Fray and Agatha Wayland, we are shadowhunters, nephilim," as Agatha spoke she pointed at each of her friends and family. "Luke Garroway, werewolf and detective, Simon Lewis is formally a mundane and currently a vampire," Simon grinned and waved, they were lucky that they had arrived in Sunnydale in the dark otherwise Simon may have been dust.
"Are you all related?" Willow questioned, she seemed to be the only one that had picked up on the last names.
"Mostly," Isabelle answered for them before looking at the group. "Who are all of you?"
"Rupert Giles and Wesley Wyndam-Price and we are Watchers," Rupert spoke motioning to Wesley who had started moving towards the phone.
"Mister Wyndam-Price I would advise against moving until we are all introduced," Agatha glared at the older man, watching as Magnus' fingers sparked blue and he gave a gentle push and he was back standing beside Giles.
"Buffy Summers, vampire slayer," Buffy raised her hand, unsure of exactly why they were there.
"Willow Rosenberg, witch in training I guess," Willow spoke quietly looking at Oz for reassurance.
"Daniel Osbourne, werewolf," was all Oz said looking at Willow and then at the moon which wasn't full thankfully.
"How much control do you have over being a werewolf?" Luke questioned, looking at the teenager before him as he spoke as he had noticed him look at the moon.
'Uncle Luke! Not now,' Agatha spoke silently to Luke who simply glared at her before their attention was on Xander.
"Xander Harris...human nothing special about me," Xander told them disjointedly, casting his eyes down to the ground.