Glad to see Lucifer was in the crossover and oh yeah, as a fan of the show, I'm adding him to this. Sorry I haven't uploaded anything during the month, far too busy with work unfortunately. Also being sad, was told Matt Lewis aka Neville Longbottom was at a pub a mere 5 minute walk from me, ended up having to miss out on the chance to meet him :( Anyway, on with the story.

Kara looked up as the skies turned red and heard the screams of people outside.

"What are we going to do?" Alex asked, looking at the agents of the DEO scrambling to get into their gear. How did you fight something that you had no idea where it had appeared from or why?

"Wait, wasn't this in that Elseworlds scenario, didn't the skies turn red when the Monitor attacked everyone?" J'onn asked Kara.

"Yeah it was, which means he's involved in this somehow. Didn't he say something about a Crisis back then?"

"What did he say about it?" Alex asked.

"He just said the fate of the multiverse was in peril, and that a Crisis was coming. I'm worried that this may be the Crisis he spoke about." Kara said.

"If it is, what can we do to stop it?" Brainy asked.

"Wait, you're from the future Brainy, how did we defeat it? In the future, you clearly all survived it, how did we stop it?" J'onn asked.

"Unfortunately J'onn, I have no memories of this event. Either it never happened in my timeline, or the memory of it and how it was stopped was wiped from the collective memory of the entire universe. I'm sorry, I can't be of more help." Brainy explained.

"I'm sure you can help us come up with a plan with your 12th level intellect." Kara assured him. "For now though, we need an actual plan. We can't just wait for whatever this event is to happen, we need help."

"What are you suggesting?" Alex asked.

"We might need to go back to Earth-1, and get the help of their heroes."

/

Barry raced around Central City as the people began to panic, the skies turning red being an unusual occurrence even for the weirdness that Central City was used too during the past five years. This though, this was different. Far more dangerous and deadly and somehow, people could sense that.

"Barry, what do we do about this?" Cisco asked in his ear piece as Barry raced around the city. What could he do about this? It wasn't like he could just say some magic words and make it all ok again, how did he try to evacuate people when it would be an entire planet affected by this?

"I don't know, Cisco. I can't evacuate an entire planet of people, and you know what the Monitor told me. I die, this is the end for me." Barry said to him. "I don't know what I do to save everyone, but I have to do it, somehow, today."

"We need to think of something though, we can't just expect help to appear out of nowhere." Ralph said as he headed towards where Barry had stopped.

"Maybe we can actually." Barry said with a start. "Cisco, can you call on the Wave Rider?"

"Already on it." Cisco replied as he punched into the computer in the Cortex, sending a call directly to the Wave Rider.

/

"Ray, what's the situation?" Sara asked as they lurched through the time stream, having just escaped from another attack from time pirates.

"We got away from them Captain, but I'm not sure if we can keep doing this. We've gotten a few hits on the exterior of the ship, we could do with landing in a safe time period and carrying out some repairs. Shouldn't take more than a few hours though."

"Gideon, find us a safe area to land." Sara ordered the mainframe.

"Captain, I've received a call from 2019, Cisco Ramon needs our help. I recommend we land there." Gideon advised.

"Set course for 2019 then." Sara said, wondering what they could possibly need from the Legends.

As the Wave Rider flew through the time stream, it suddenly began to shudder and shake, the ship veering from side to side, throwing the Legends around as it struggled to land, finally breaking through and crashing outside of STAR Labs.

"Gideon! What's with the rough landing?" Sara asked the AI, annoyed as she got up off the floor.

"My apologies Captain, but this is a place that even the Time Masters avoided, a time of great destruction and death, my programming doesn't like that we are here."

"What's going on? What happens?" Sara asked with worry in her voice.

"I think I should tell you all that." A new voice said, turning Sara saw Barry stood at the bridge.

"Barry, what's going on?" Sara asked.

"Can you get the rest of the Legends up here, actually, never mind." Barry grinned before flashing away, returning a few moments later with the entire Legends crew looking around in a daze.

"How did I get here?" Mick asked.

"Barry!" Ray said excitedly when he saw him. "How are you doing?"

"Not so good, Ray, there's something bad, really bad, going on." Barry explained.

"What is it Barry, what's happened?" Nate asked.

"Crisis is here." Barry said simply. "A threat that will end the entire multiverse and all life within it, unless it's stopped. The problem is, we don't know how to end it."

"What's this Crisis?" Sara asked.

"Just look outside." Barry said.

The Legends headed out of the Wave Rider to see the skies had turned blood red, that lightning forked all around it and the screams of people in the distance, in the city.

"What's happening?" Charlie asked over the sound from the city.

"An Anti-Matter wave is coming. It has already destroyed multiple Earths and every minute, more die. We need to somehow stop it, save the multiverse and if possible, reverse it. But there's more."

"What could possibly be worse?"

"Payment must be made."

The Legends turned to see an imposing figure with a balding head and blue armour.

"Who are you?" Sara asked the newcomer.

"I am the Monitor." The man, The Monitor, said.

"Hi, Mr, Monitor, was it?" Ray asked. "What's going on and if this is you, can you kindly stop?"

"The Crisis is not of my doing. I only seek to stop it, having tested countless worlds and countless heroes to attempt to avert it. I believe I now have those who can, but there will be a high price to save all of reality."

"What sort of price?" Zari asked.

"Worlds will live. Worlds will die. The universe will require the blood of many to survive. Including some of you." The Monitor said.

"Some of us, like who?" Mick asked.

"Me." Barry said, as the Legends turned to him. "For billions to survive, the Flash must die."

"Does Kara know?" Sara asked, eyes wide.

"No, and I don't want to let her know. I can't let her be distracted in her part of all of this." Barry said.

"Barry, I'm sorry, I don't know you, Hi, I'm Charlie, but that is fucking shit." Charlie said, shocking Barry.

"What do you mean?"

"Kara deserves to know. You'll hurt her more by keeping it from her. She has the right to know, to make her own decisions." Charlie explained as Ray nodded.

"She's right Barry. As for you, Monitor, what are you doing to stop this?"

"My plans are wide and varied, Ray Palmer." The Monitor told him. "Suffice to say, do as I command, and you shall all live far beyond this Crisis, fail and the multiverse will die." He said before vanishing before them, leaving them all stunned.

"So, what can we do to help?" Sara asked Barry.

/

"Kara, where are we going?" J'onn asked.

"STAR Labs is the best place to start, the rest of the heroes from Earth-1 are probably already there, it would be the best place to try and team up with them, we need everyone we can to stop this." Kara told him. "Alex, have you gotten hold of Clark yet?"

"He'll be here in a few minutes, he's bringing Lois and baby Jonathan with them." Alex told her. "So, back to Earth-1 then. Why aren't we making a stand against this thing here?"

"We need as many people as we can to stop this." Kara told her. "We need to get everyone together, then bring them here to help."

"We got here as quickly as we could." Kal said a few minutes later as Lois shushed baby Jonathan and he stood around waiting for Kara to fill him in.

"Remember the red skies last year when we headed to Earth-2 to help everyone stop the guy with that Book?"

"Yeah, is it something to do with that guy again?"

"It might be, we're heading to Earth-1 to grab the others and see if we can stop whatever is happening. I wish Barry had come with me this morning." Kara said sadly.

"I'm sure he'll be here as quick as he can, with everyone he can gather." Alex told her.

"I hope so, I don't know what we can do ourselves, it took all of us last time against the Book, if its back somehow, we really need all hands on deck."

"I'm sure they'll gather as soon as possible."

"Let's go." Kara said, pressing the extrapolator and opening the portal to Earth-1, the group stepping through the breach.

/

"Barry." Oliver Queen said as he and the rest of Team Arrow lined up alongside The Flash.

"Thanks for meeting me." Barry told them.

"Barry, we've seen the skies, it's the Monitor, isn't it?" Oliver asked with a sad smile, walking off to the side with Barry.

"Yes, sorry Ollie, he came to me when we got the Legends to come to Central City. We need everyone in Central."

"We'll be there. What about Kara?" Oliver asked, gauging Barry's reaction. "Have you told her yet?"

"No, Ollie, and I won't tell her unless I have no other choice." Barry told him.

"She deserves to know, Barry." Oliver said, looking sternly at him, Barry wilting under his gaze.

"I know, but, she's lost so much already, I can't hurt her like that."

"Don't you think it'll hurt her more when you die in front of her, without her at least being prepared for it?" Oliver asked him.

"I guess you're right, Oliver. I'll think about it, ok?"

"Good. Now, Central City?" Oliver asked.