Disclaimer: I do not own Charmed, Buffyverse or Supernatural.

After how Cordelia (that was how she preferred to be called) filled everyone in, everyone was lost for words, to say the least as they all sat down in the living room, processing the story.

"So, let me get this straight." Piper said, clapping her hands as she paced around. "You used to be Queen Bitch teenager in high school and helped Buffy with her Slayering before you decided to pursue acting career in L.A., where you and Angel and some of your friends decided to fight as champions of good for the Powers That Be and the Elders due to becoming psychic like Phoebe. Then you ascended to the Upper Regions and briefly became one, even higher than the Elders but then you got possessed on your return to Earth by a rogue member of the Powers That Be named 'Jasmine', who you gave birth to…"

Angel, Buffy, Willow and Dawn clenched their fists and growled at the memory as the fingernails buried into the skin on their hands.

"…and then she brainwashed the whole world into creating an Utopia while eating humans as a snack until one of your friends snapped out of it and then you found the demon who knew Jasmine's true name and he said it close to Jasmine, stripping her of her power and then you killed her, while Kyra… Cordelia ended in a coma until the Powers That Be allowed you to create an astral form to help Angel find a way to defeat the Wolf, the Ram and the Hart, the Senior Partners, a group of higher being demons, which you did by killing their agents, the Circle of the Black Thorn.

Then they sent L.A. to Hell before you helped Angel get back on track one more time but before you could return to the Upper Regions, the Senior Partners tried to vanquish you and you survived by merging your essence with the essence of the Seer of the Underworld and merged with her and was reincarnated as Kyra, which led to our Avatar mess."

"That about sums it up." Cordelia said with a shrug as everyone stared in disbelief.

"Uh… huh?" Phoebe said out loud what everyone was thinking.

"We've seen weirder things happen." Spike said and no one could disagree.

"But, wait… so you didn't remember anything at all?" Angel asked, approaching Cordelia and holding her hand like if she would disappear again if he ever let her go again, reliving what had happened years ago, when she disappeared and returned again.

"Not as Kyra, until Zankou." Cordelia said and Angel snarled. He had never met him but he had heard enough about him.

Two years ago

In the attic, Piper and Phoebe were ready to turn Kyra into human before Phoebe told Piper to get the spell ready as Piper left.

"Hey." Phoebe said as she paced around Kyra, eying her new clothes. "You look really great."

"Sure you don't mind me borrowing it?" Kyra asked.

"No, not at all. Although I'm much more of a black kind of a guy myself. I think it's a lot more appropriate for a funeral." Phoebe said as her eyes were suddenly full of malice and darkness. "Don't you, Kyra?"

Kyra frowned. She had never told her name to Phoebe before. "Wait, how did you—" She gasped, when 'Phoebe' grabbed her by her throat and turned into Zankou.

"Hello, sugar." Zankou smirked.

"Did I call you that ever?" Kyra sneered. "What I meant to say was, 'Hello, swirling particles of scum.'"

"You always were amusing. But still, I can't allow you to betray us all just to save your own ass." Zankou said as he shoved Kyra before he unleashed a swarm of red and black particles on Kyra, who screamed in pain, writhing, while he smirked gleefully. "It's good to be back."

He turned around to see Phoebe and Leo orb in and flamed himself away, just for them and Piper who had entered to see Kyra vanquished as she burst into flames and vanished, much to their horror.

Elsewhere, Prue was in her hideout with a circle of candles formed around her.

"Those who dwell in the darkness, hear my call
As the shadows begin to fall

The hands of time will bend to mine
And break before me, sundered twine

Guide the lost soul through the void's night
Hear my voice, for I am your light"

A flash of light appeared on the floor that formed into a shape of a woman until it turned into Kyra, naked as she groaned and stirred, coming to, while Prue placed a blanket on her shoulders. "Hello, Cordelia."

"What…" Kyra looked confused, gathering her thoughts as she clutched the blanket to cover herself. "What did you call me?" She had never heard of this 'Cordelia' but for some reason, the name sounded familiar.

"That's your real name. Cordelia Chase." Prue said as Kyra blinked and frowned, as if memories started to resurface and fog was lifted, clearing her sight.

"Oh, my God… I remember… my high school… Buffy… Harmony… Angel… Angel!" Cordelia was about to get up, when Prue held her down.

"Stop. You need to rest. It's not the right time. Your friends are on the right path right now and when the time comes, we will guide them again." Prue said.

Present

"Long story short, the Powers That Be showed me what to do in the right time." Cordelia said.

"That's how you reached out to me again." Angel realized.

"And now is the right time." Prue explained. "If we don't stop Neena now, the universe as we know will be destroyed, all in her attempt to reunite with her mate."

"And you don't want to know what does it look like in the future." Melinda said. "I lost my brothers and cousins, Neena killed almost all witches who were her bloodline and tore the reality itself apart. Demons and whitelighters, vampires, zombies, all of them tearing each other apart only because Neena wanted to rewrite the rules and broke the universe itself."

Everyone shuddered from the idea, though Dean and Sam and Angel and Spike had a general idea how such a nightmare might look like.

"How exactly are we gonna do that? She banished me from the Upper Regions once. How are we supposed to return there?" Paige pointed out.

"There is a way and there is a spell but it's going to take a while." Cordelia explained.

"We'll prepare the spell. If you have any weapons or allies that might help, get them. We're going to war." Prue said.

"We've got something that might help." Dean said as he turned to Paige. "Can you orb us to Lebanon, Kansas?"

Angel and Cordelia went aside as he eyed her dress. "I can't believe it. You look…"

"I know. Remember that producer who wanted me for that commercial that you almost ripped him a new one?" Cordelia asked as Angel chuckled.

"Cordy…" Angel trailed off. There were countless of things on his mind but right now, all he could say was one thing. "You have no idea how happy I am to see you."

Cordelia chuckled. "I hope you're not perfectly happy, since that would make things much worse for us."

Angel chuckled back. Same old Cordelia. He couldn't bring himself to say more as the floodgates started to open and tears poured down his eyes and they kissed fiercely.

"You have no idea how happy we are to see you." Dawn said, hugging Tara tightly.

"I missed you too." Tara said, fondling Dawn by her hair. "And I'm glad you're OK."

"As well as I could be." Dawn said. "Were you… alright?"

"Took some time to heal but I'm here to be for you all. For good this time." Tara said as Dawn could feel her eyes get wet as she hugged Tara as tightly as she could, worried she would vanish if Dawn let go.

"I'm happy to see you again, Spike." Buffy said as she went aside with Spike.

"Me too, Slayer." Spike said as he looked at her awkwardly. "I wanted to give you some space and time after that mess with Twilight but when Angel got a vision that something was going on here, we got here as fast as we could."

"You and him?" Buffy asked, surprised they would actually work together. While she had known that Angel and Spike had put aside to an extent their grudge against each other.

"A lot can change over the years." Spike admitted.

"Thank you for helping." Buffy said.

"This time, I'm with you until the end. Whether we make it or not." Spike said.

"We're gonna face it together. Like we always do." Buffy said and Spike nodded as they felt drawn to each other until they kissed.

The bunker of the Men of Letters

"Paige, I've assembled as many Whitelighters and Elders who are on the ground as I could but are you sure it will be enough?" Samuel Wilder, Paige's father, asked over the phone.

"All we need is for you and your friends to get us up there and then you're gonna haul ass and stay back. No sticking around to be a hero, you've died enough times already." Paige said.

"You can't ask me to leave—"

"Please. I'm begging you, don't throw your life away again. I can't lose you again." Paige begged, on verge of tears.

After a few moments of hesitation, she heard Samuel's voice crack. "I understand. I love you."

"I love you too, Dad." Paige said before hanging up as Dean turned to her, looking at her in sympathy before Castiel showed up with a bundle of angel blades.

"I'm not sure if it hurts these kinds of demons but it should give us an edge." Castiel said.

"And this should also help." Dean said as he picked a spear with a silver tip.

"What's this?" Paige asked.

"The Lance of Michael." Dean said and Paige's eyes widened.

"Michael, as in Archangel Michael?" Paige demanded.

"I'm a vessel of Michael. Long story." Dean said.

"Even if that bitch disarms Dean, it'll give us an edge." Faith said as she showed up with another bag of weapons

"OK, let's get back home now." Paige said.

"Wait. Not yet. We're gonna need a backup. And a very big one. How far can you teleport?" Faith asked.

"It's called 'orbing.'" Paige corrected.

Halliwell Manor

"I just can't believe this is happening all over again." Phoebe muttered as they sat in the living room across each other.

"My adult daughter from the future and our dead and reincarnated sister are back to help in another apocalyptic battle." Piper said.

"I know this must feel strange." Melinda said.

"So, that's why you never came back?" Phoebe asked, turning to Prue. "Because…"

"I can't be involved if the Power of Three is tethered to you two and Paige. I removed myself from the equation since otherwise you wouldn't have been able to reach your fullest potential, I would've only held you back." Prue explained. "But I never stopped watching over you…" Her eyes were getting wet as she looked at them with pride. "And I couldn't be prouder of you than I am now."

Piper and Phoebe were about to hug her, when Prue suddenly jerked back. "No, wait!" They looked at her in confusion. "You can't touch me."

"What? Why?" Phoebe asked, confused, when it hit Piper.

"The Power of Three." Piper realized.

"The power was meant for us three, not Paige, but I stayed back to allow it to flow through her, since her power is similar to mine, the only reason she could touch me was because her power was similar to mine. The four of us have Melinda Warren's powers. If we all get together, it will only weaken the Charmed Ones, since the prophecy didn't foresee four sisters but three." Prue said and Piper and Phoebe considered, remembering when they vanquished Gideon with their evil doppelgangers, the Power of Four did not feel as strong as with Power of Three. "Look, I don't like this any more than you do but if I stay here, for all I know, the consequences could be cataclysmic."

Piper and Phoebe felt their hearts shatter.

"So, what, after Neena…"

"…you're going to leave." Both of them realized.

"I'm sorry… but it's the only way the Power of Three stays intact." Prue said.

Tears formed in their eyes as they sniffed.

"It's just not fair. We just got you back." Piper said, her voice breaking.

"I know… but I'm not going anywhere." Prue said as she almost held Piper by her cheek, only an inch away.

They heard a doorbell as they turned to the door.

Willow went to open the door to see Paige, Dean, Sam, Castiel and to her surprise…

"Kennedy?" Willow eyed her ex, Xander and other Potentials and members of Buffy's Slayer squad, among them Faith, Satsu, Leah, Rowena and Vi among other.

"So, you said you needed backup. Where's the fight?" Faith asked.

Tara and Dawn were about to go downstairs, when they heard maniacal female cackling.

"The Key…"

"What is that?" Dawn asked.

"Dawn?" Buffy asked as she and Spike entered.

"You were fools to bring her here. She's the last component I need."

Suddenly, it hit them all like truck as Buffy turned to Dawn. "Dawn, run—"

Suddenly, a beam of energy struck Dawn as she screamed. "AAAAGH!"

"Dawnie!" Buffy and Tara exclaimed at once, while Neena shimmered in.

"I can break the barriers between all dimensions thanks to her now, so I'd like to thank you for bringing her here." Neena said as Dawn started to turn into vapors of energy.

"Buffy!" Dawn screamed.

"Dawn!" Buffy yelled as she reached out to grab Dawn's hand but it just went through her.

"Help me!" Dawn exclaimed before she faded in vapors that formed into a glowing orb of energy in Neena's hand as Buffy, Willow, Tara, Angel, Spike, Dean and Sam glared.

Tara was about to use a spell but Neena threw her and Spike backwards, sending them sliding down the floor as Tara hit a table that collapsed, while Spike crashed against a drawer full of magical equipment.

"I'M GONNA KILL YOU!" Buffy yelled, about to lunge at Neena with the Scythe but Neena knocked her and everyone else back with a telekinetic blast before she pulled the Scythe towards her.

"Thank you, Slayer for bringing the weapon to me. It's going to make things much easier for me." Neena said before shimmering away.

"What's going on?" Piper demanded as the sisters and the rest rushed upstairs.

Buffy got up on her feet as she looked horrified. "She took Dawn. She turned her back into the Key!"

The Scooby Gang's and Team Angel's eyes widened in horror as well as Dean's and Sam's.

"Wait, the Key? What Key?" Phoebe demanded, confused.

"It's a long story, but if she has the right knowledge and enough power, Neena can use Dawn's energy to open the door to any dimension." Willow summed up.

"If she uses the Key to break the barriers in the Upper Regions, it will tear the whole universe apart. She'll attempt to merge Heaven, Earth, Hell, all dimensions to find the one where her beloved is. We have to stop her." Cordelia said as they heard the storm above them.

"But we can't go up there, can we?" Buffy reminded.

"She's probably not going to care what gets in, she only blocked our way out." Paige said.

"And you're not gonna go after her alone." Prue said.

"Are you sure it's gonna be enough? Neena has an army of demons and Darklighters and who knows what else." Dean pointed out.

"We have our own army." Willow reminded.

"We have a spell that might work against Neena but we need to get close to her. The Power of Three." Prue said as she turned to Piper, Phoebe and Paige. "It has to be the three of you. I can't."

"So what's the plan? Storm the gates of Heaven and get it back from the first witch?" Angel asked.

"When you put it like that, sounds like bollocks." Spike said.

"We've heard crazier." Angel shrugged and Spike nodded.

"Are you sure we can win against her?" Kennedy pointed out, not uncertainly but stating a fact.

"This is 'all or nothing.' We have to stop her. Whatever it takes." Buffy said.

"Whatever it takes." Willow nodded.

"Whatever it takes." Dean said.

"Whatever it takes." Sam said as everyone sans Prue joined hands.

"Whatever it takes." Piper, Paige, Phoebe and Prue and the rest said at once.

I used 'Samuel' for Paige's father to avoid confusion with Sam Winchester.

Not sure if I did well with Angel/Cordelia, Willow/Tara and Dawn and Buffy/Spike scenes and with Prue and Melinda but hope it was OK and hope my explanation on Cordelia makes sense, since I got this from a discussion with Aragorn II Elessar.

On the bright side, Faith and Cass are here too, with more Slayers to help and don't worry, I'm not gonna do any crap with Kennedy for her to be annoying, since she was better in comics, while far from my favorite character, I found her tolerable despite some annoying moments, on the bad side, this is so not good. This is inspired by the comic books, Aragorn II Elessar's 'Heroes, Vampires and Slayers' and Chunk127's 'United We Stand'.

In the BTVS comics after the death of magic in Season 9, Dawn started to fade away and disappear and everyone started to lose their memories of her before the Seed of Wonder was restored, but I'm not going to go down that route with everyone forgetting Dawn, since with what I have planned, this just wouldn't fit and remember that after Willow went Dark Willow, she threatened to turn Dawn back into the Key in its original form as a ball of energy.

The next chapter is going to be the climax of the story and then epilogue.

So, what do you guys think about it?

Please review and let me know if you are enjoying this so far and want for me to continue.