So, here's something I've been working on for a few while now. It's nowhere near finished, but I thought it was time to at least start it.

First, thank you to Aragorn II Elessar for his help with this, as he has given me some suggestions, feedback and allowed me to bounce some ideas off him, so thanks buddy.

As the title suggestions, it'll be a Buffyverse multi-fandom story. More fandoms will join down the line, but to start with the fandoms (outside Buffyverse obviously) will be the MCU, Arrowverse, Smallville, Doctor Who, Leverage, Teen Wolf (the show, not the 80's movie) and Percy Jackson and the Olympians (the books, not those other abominations that tried to pass themselves off as PJ).

Anyway, on with the show.

Earth-92, Sunnydale

Buffy Summers, the woman chosen to be the Slayer, was addressing her allies in a room- Spike, Willow, Faith, Xander, Dawn, Giles, Anya, Andrew, Wood, and all of the Potentials, including Amanda, Violet, Rona and Kennedy.

"I hate this. I hate being here," Buffy said as she paced around. "I hate that you have to be here. I hate that there's evil, and that I was chosen to fight it. I wish, a whole lot of the time, that I hadn't been."

She then looked at them all and added. "I know a lot of you wish I hadn't been either."

Kennedy and Rona looked away in shame.

"But this isn't about wishes," Buffy said. "This is about choices."

All looked at her as she said. "I believe we can beat this evil. Not when it comes, not when its army is ready, now. Tomorrow morning I'm opening the seal."

She then made her declaration.

"I'm going down into the Hellmouth, and I'm finishing this once and for all."

She then addressed the others. "Right now you're asking yourself 'what makes this different? What makes us anything more than a bunch of girls being picked off one by one?' It's true none of you have the power that Faith and I do." She gestured to herself and Faith as she said that.

And then she came to the main part of what she was saying.

"So here's the part where you make a choice."

She started pacing around. "What if you could have that power...now? In every generation, one Slayer is born... because a bunch of men who died thousands of years ago made up that rule."

She paused before continuing. "They were powerful men. This woman," she pointed to Willow, "is more powerful than all of them combined." Willow whimpered and gave a nervous smile.

Buffy walked past Willow. "So I say we change the rule. I say my power..." She gestured to herself. "Should be our power." She gestured to all of the Potentials.

They looked at her with hope in their eyes as Buffy said. "Tomorrow, Willow will use the essence of the scythe to change our destiny. From now on, every girl in the world who might be a Slayer...will be a Slayer. Every girl who could have the power... will have the power... can stand up, will stand up. Slayers…..everyone one of us. Make your choice. Are you ready to be strong?"

Next day, Sunnydale High, Hellmouth

Buffy, Spike, Faith and the other girls had climbed down the seal into the Hellmouth.

Spike looked at the amulet he worn around his neck. "Not to be a buzzkill, love, but my fabulous accessory isn't exactly tingling with power."

Buffy psyched herself up as she looked around slack-jawed. "I'm not worried."

"I'm getting zero juice here, and I look like Elizabeth Taylor," Spike commented.

"Cheer up, Liz," Faith said with dark humor. "Willow's big spell doesn't work, it won't matter what you wear."

Buffy, Faith, Spike and the others walked forward to the edge of a cliff where they could look out and saw thousands upon thousands of Turok-Han below them on the floor of the Hellmouth.

"I'm not worried," Buffy said.

The Turok-Han were growling and making noise as they mobbed below them. Spike backed up.

"I'm not worried," Buffy said again.

"Really?" Rona asked. "'Cause I'm flashing back to Xander's whole bathroom speech."

"Buffy—" Amanda said, frightened.

"I'm not worried...as long as Willow can work her spell before they—" the Turok-Han looked up at Buffy and gang. "-see us."

The snarling Turok-Han army rushed toward the cliff where Buffy and gang were positioned.

As the Turok-Han army advanced toward Buffy and gang, Buffy held her ground and said under her breath. "Willow..."

In the Principal's office, Willow was performing a spell while holding onto the scythe laid out in front of her. Suddenly, she was overcome with power. She looked up, as the scythe and Willow started to glow with a bright white light. Willow was breathless at this point.

"Oh...my...Goddess..."

And then Kennedy sat up, smiling and confident.

Earth-1

In Star City, at City Hall, Thea Queen was writing a document when she felt a burst of strength flow through her. Thea gripped the pen a little too tightly and it broke in half, ink splatting at her hand as Thea looked at it in shock.

In Midway City, Patty Spivot was getting out of the shower in her apartment, wrapping a towel around herself when she wiped the stream off the mirror. To her shock, the mirror cracked as she touched it. Patty stepped back, looking down at her hands but finding no injuries.

Earth-21, Smallville

Lois Lane was at typing at her computer when a burst of strength seemed to go through her and she hit a button too hard, causing a crack to split down the center of the keyboard. Lois jumped, staring at the keyboard in shock before looking down at her hands with a bit of fear.

Earth-25, boarding school

In their dorm room, Annabeth Chase was doing her homework while Thalia Grace was listening to some music on headphones behind her.

As Annabeth wrote an answer on the paper, she felt a surge of strength go through her and her pencil suddenly snapped in half, startling her as she jerked up.

"Annabeth?" Thalia asked, taking off her headphones as she looked at her concerned. "You ok?"

Annabeth was silent, looking down at her hand before glancing down at the broken pencil; sure she hadn't been gripping it tightly enough to break it. And then there was that strange burst of strength.

"I think we need to contact Chiron," Annabeth told Thalia.

Earth-63, Pond-Williams residence

Amy Pond was on her phone, talking to her manager when she felt a surge of power and gripped her phone just a bit too tightly and let out a startled yelp as her phone's screen cracked.

Her husband, Rory William, raced in from the other room, having heard her yelp.

"What happened?" Rory asked, looking around but finding nothing but Amy staring at her broken phone. "Amy?"

"I don't know…but I think we need to call The Doctor," Amy finally said, still looking at her phone.

London

At a hospital, Martha Jones was getting supplies as she readied for surgery when she felt a presence behind her. On pure instinct, Martha whirled around and sent a spinning kick to the chest of a co-worker, sending them flying back and hitting a shelf, which he knocked.

"Eddie!" Martha exclaimed as she saw that she'd done, immediately rushing over and startling to help him up. "I'm so sorry."

"My fault for sneaking up on you. But since when do you know kung-fu?" Eddie asked as she helped him up.

Martha didn't answer, wondering the same question.

Portland

Same time

Parker was in a vent, she, Eliot and Hardison on a job when she put two hands on either side of the vent, stunned when the bent slightly as she pressed down on them.

"…Hardison? Eliot? Is it normal for vents to bend when you touch them?"

Earth-211, Beacon Hills

Same time

Lydia Martin sat up in bed, relaxing on her day off. She was on spring break from college, and she was meeting up with Scott and the others to discuss the next part of dealing with their plan to deal with Monroe.

But, as she reached over to grab her phone, she missed, hitting the side of her nightstand instead. Lydia almost jumped when her light touch pushed the nightstand over, sending her phone and alarm clock falling to the floor.

Earth-199999, Avengers Compound

Same time

In the gym, Natasha was training, striking a punching bag when a burst of power flowed through her just before she struck the bag. Natasha was stunned when her fist went right through the bag.

In her room, Wanda was absently playing her guitar when she felt something she couldn't explain happen, energy she couldn't quite describe shot through her before she heard a snapping sound and looked down, stunned to see her fingers had snapped the strings of her guitar.

New York

Elsewhere, a blond girl was doing a handstand when she felt a surge of power go through her. She jumped to her feet, whirling around and striking a wooden post, stunned when it snapped in half.

Germany

Sharon Carter was studying a plan of a building when she gripped too hard on the edge of a table, breaking a piece off with her hands. Sharon umped back, staring at the broken piece of table as it fell before looking down at her hand with a bit of fear.

All across the multiverse, the same things were happening, girls and women receiving powers they should never have been forced to have. And it would be months before Buffy Summers would realize the consequences of her actions. For she had no idea what she had set in motion.

As per usual with me, Smallville's earth is Earth-21, not 167 because I refuse to acknowledge that as Smallville's Earth.

And you read that right, Leverage exists on the Doctor Who Earth.

I do think something like the Teen Wolf Banshee would be considered human enough to be affected by the Slayer Spell, which is how Lydia got turned.

Annabeth and Thalia would be played by Dakota Fanning and Masie Williams.

So there's no confusion, here's the timeline for the non-Buffyverse fandoms:

MCU: A few months post Age of Ultron.

Arrowverse: Just after Arrow 5x01 and Flash 3x01.

Smallville: The beginning of season six, just after 6x02.

Doctor Who: Post 'The Doctor, The Widow and the Wardrobe'.

Leverage: Post 'The Long Goodbye Job'.
Teen Wolf: Post series (and there is no movie).
Percy Jackson: Post 'Sea of Monsters', a few months before 'Titan's Curse'.

And that's all for now. Hope you enjoyed this little tease.