It was just a normal day, Lena had been sitting in meetings and trying her best to keep her mind at ease. Sam was safe now. She was free. But Lena couldn't shake the feeling something was off, something was wrong. She went through her day all the same though, she had even planned a lunch 'date' with Kara, something she had been missing these last couple of weeks. Kara had acted strangely the last time they had seen eachother, but Lena thought that must've just been the stress of worrying about Sam. At least she would get to see that smile again. Lena felt her heart flutter at the thought of talking to Kara. She had truly missed her best friend.

That is when it all started crashing down though. The lunch that was supposed to be a push in the right direction. A gateway back to normalcy. Kara and Lena were in the elevator, laughing and talking about what they've been up to, catching up. When an explosion stopped the elevator on its track. Once the recovered from the initial explosion force the women made eye contact and went into survival mode.

Kara could hear Lena's heart pounding out of her chest, knowing that this could very well be another attempt on her life. Kara scanned the surrounding area outside the elevator to try and get a grasp on the situation. Lena pulled out her phone to try and call for help but there was no service. They once again made eye contact and tried to calm one another with a look. Smoke started to crawl through the small seams of the elevator, and that is when Kara decided to knock out the top hatch of the elevator. Kara immediately cursed herself because she knew that no human would have been able to get that open that easily. Lena had noticed but attributed it to adrenaline. Kara got herself out into the shaft and reached down to help Lena up, making sure to act like she had normal human strength.

Once they were in the elevator shaft they could hear the gunfire, followed by screaming. Kara rushed to the latter and motioned for Lena to follow her.

"We don't know what we're dealing with Kara,"

"I have to do something,"

They reached the next level and managed to get the doors open without raising any suspicion. It was clear the shooting was on the floor above them. People were rushing to the stairwells trying to escape the building. Kara shared a glance with Lena, and silently they went back into the elevator shaft and went up to the next level, where the doors had been seared by what they both assumed to be the source of the earlier explosion.

Kara wanted to tell Lena to stay, to get out of there. To get safe. But she didn't want to raise anymore suspicions about her identity.

"I wish I could tell her," Kara thought as she entered the floor from the seared doors of the elevator.

She did a quick scan of the floor before moving anywhere else and found that there were indeed two gunmen and they were close. Kara instinctively grabbed Lena's hand and led her away from the gunman into her office, where she knew Lena had a safe room. Once they had gotten into her office and opened the safe room, Kara made sure Lena would call for help.

"Call Alex, stay here, don't move."

Lena's eyes searched Kara's for some sort of explanation.

"Kara, why are you saying that as if you're about to go fight the bad guys?"

Kara didn't answer her, she just kissed Lena's forehead, shut the door to the safe room and took off in the direction of the gunmen. She knew she was in bad shape when her x-ray vision started to blur. But as she approached the gunmen she kept feeling weaker, and she knew the reason. The gunmen had a case, and Kara assumed correctly what was in it. Kryptonite. She could feel the burn start to ache in her body. She needed a game plan.

…

Lena started to panic, she had called Alex but she wouldn't pick up. She assumed that she was already on her way, but that still didn't ease her nerves. She pulled up the CCTV footage from that floor, flipping until she found Kara, crouched under a desk in the room closest to the gunmen. She felt her heart drop, the woman she loved was voluntarily putting herself in danger. And Lena could do nothing about it, because her safe room operated in the way that the door was sealed for thirty minutes and then whoever was inside could unseal it. She was scared, for the first time in a long time she was genuinely, unabashedly afraid. She was afraid for Kara, the woman she loved but neglected to tell in order to save their friendship.

"Christ, Kara you better know what you're doing,"

…

Kara sat crouched under the desk for a while. Listening to the men. Her heart dropped when they finally acknowledged why they were here.

"We stole the kryptonite, we need to leave."

"No, Lex said that if we had the chance we had to kill his sister,"

"We don't even know if she's still here. Besides do you really want to chance an encounter with Supergirl?"

"Even if she did show up, the kryptonite we have here is the most potent kind. Even if she got a shard stuck in her hand she would die,"

Then gunmen made a move towards Lena's office with their guns raised. Another explosion went off two floors below them and the men looked at each other and nodded.

"We need to move fast," and with that they picked up there pace down the hallway towards Lena's office. Kara had to act and fast, she knew Lena would leave the second those thirty minutes were up. She'd be walking into a death trap. She followed the men into her office and she heard the camera in her office make the slightest movement. Lena was watching.

Kara had to think fast, it wouldn't be long until they figured out where her safe room was. She stood at the edge of Lena's office just out of sight of the men. She let a breath out and slowly took her glasses off her face, her eyes found the camera and Kara mouthed an apology, knowing that Lena would see. She hoped she would understand, even though Lena was done with Supergirl. She then stepped into the men's sightline.

"If you give me the kryptonite, I won't hurt you." Kara lead with, she slowly took steps toward them, trying to play off the weakness. The kryptonite was hitting her faster and harder than normal. She had to keep going though.

Kara didn't waste a moment more, pushing herself to speed to the couch and throw it at the gunmen, it only knocks one out but the other is determined. He lines up the shot but barely misses. The bullet still cuts through her skin though.

"Kryptonite lienes bullets, you can't win this,"

Kara's eyes leveled with the man's as if to accept a challenge. Kara knew how dangerous this would be. She had to win, no matter what, she had to keep Lena safe.

…

Alex and her team were racing to get to the top of Lcorp. From the voicemail Lena left, she knew that Kara was in danger.

"Alex, they already have the synthetic kryptonite, and from the CCTV it looks like they are facing off with Supergirl in Lena's office." Winn's voice was shaky over the comms, he tried his best to keep his cool. There had been a hundred situations like this involving kryptonite. He had faith in Kara. They all did.

Alex burst through stairwell after stairwell, letting the adrenaline push her to go faster and faster. She couldn't bare the thought of losing Kara. Not after everything they had been through this past year.

"Come on, Kara. Stall a little longer. I'm almost there,"

…

Kara continued to grow weaker with every hit. It seemed like for every hit she landed, he would land five more. This kryptonite was stronger than she thought. She finally lands a kick to the chest that sends him over the top of Lena's desk. Kara had to find a way to finish this before Lena unsealed her panic room. She vaulted over the desk and put her foot on his neck just under his chin.

"Give. Up." She said through her teeth, trying to hide the shakiness in her voice. The case was less than 8 feet away from her and she has begun to lose the fight against it.

"Never." the man said and took her legs out from under her. He rose from the ground and went to the case. He opened it to retrieve the weapon he was storing all along. A kryptonite knife.

"Now, since I can't find the CEO of this company, i'm sure Lex will be just as thrilled to have one less super in the world," he finished with a smirk towering over Kara. He gripped Kara's shirt collar and drug her to the balcony.

"The whole world will see you're weak. They will know that even a god can bleed,"

Before the impact of the knife could make it into ker chest, Lena unsealed the panic room, grabbed the closest thing to her and smacked the man across the back of the head. He dropped Kara on the edge of the balcony and stumbled back.

"There you are Ms. Luthor. I've been looking for you." the man said with a grimace. "You'll pay for that," He finished as he made a move for Lena.

Kara grabbed him with as much strength as she could muster and tried to take him down again, but it didn't work. He threw her off him in one push.

"Why would you try to save her? She is nothing."

Kara looked at Lena with a small smile, and an apology in her eyes. "For those I love, I will sacrifice." and with those Words Kara again tried to take the man down.

…

The world was in slow motion. Lena tried to run to Kara, to do anything to save her. But she was too slow, the man had already hammered the knife into Kara's chest. Lena felt her heart drop, and just like that her world had toppled on top of her. She felt like she couldn't breathe. She ran to Kara, and held her head in her hands. The man stood above them and laughed.

"Kara, don't you do this. You stay with me!"

Kara wasn't responsive. It was too late. The kryptonite had killed her. The kryptonite Lena had made. She felt the cold metal of a gun against the back of her head, and she just breathed. She accepted her death as tears streamed down her face.

A shot rang out, and shortly after a thud.

Lena opened her eyes and was shocked to see that she was still in fact alive.

"Kara" she heard Alex whisper in the softest tone. Lena looked to her side and the man lie there, dead.

"Sh- She's not responsive. The kryptonite is too potent." Lena said emotionless to the room.

"She's gone," Lena turned to look at Alex. Their eyes met and simultaneously they broke. There were no tears just hard movements and stoic faces. They moved Kara onto a stretcher and into a DEO ambulance. Lena sat empty next to Alex on the way there.

"I killed her. She's gone. My whole world,"