Thanks to 4everallways, Lilietje99, I am fangirl forever, and iLoveMeSomeaptainAmerica for reviewing last time! I REALLY APPRECIATE IT!
It's finally Battle time in this fanfic! This is just the beginning, so it might not be as eventful as the ones that are yet to come. But I had a lot of fun writing this chapter!

It was almost battle time and the Shadowhunters of the New York Institute were bustling around. Tessa watched as Clary put on her gear and as Alec and Jace grabbed dozens of weapons off the walls of the Weapon's room. Even Jem was bustling around, she was surprised when she saw him in modern day Shadowhunter's gear. It was so different from the gear of the 1800's.
"Hey, Tessa?", she heard Jace say.
"Yes, Jace?"
"Aren't you going to put on some gear?"
"Oh, I don't have any."
Clary ended up running off and when she came back, she was carrying neatly folded gear in her arms.
"Here, you can use some of Isabelle's gear. You look about her size, it should fit."
"Thank you."
Tessa went to go put it on. Sure enough, it fit perfectly. She ended up strapping two seraph blades onto her back, several daggers on her weapons belt, an extra dagger in one boot and a stele in the other. She was perfectly ready.
At exactly 2:50, the group was gathered outside the Institute. Clary went up to the wall, stele confidently in hand. Soon enough, a portal stood right in front of them.
Jem grabbed Tessa's hand. "Ready?", he asked her.
She nodded.
"Wait!", yelled a familiar voice in the background.
Turning around, Tessa saw Isabelle and Crystal, the Shadowhunter girl that had arrived at the Institute the night before. Behind them stood a group of Silent Brothers and Iron Sisters.
"Izzy?", Jace asked.
"Duh! Did you really think that I was going to let you go to battle without me?"
"I was hoping," Alec said.
"Well, boo hoo. I'm going."
"Alright then. As soon as we step through that portal, there's no going back, understood?", Jace asked.
They all nodded.
"Well, then here goes nothing."
Jace stepped through the portal.
And they all followed suit.

When they got out of the portal, they were in front of a huge field. It looked somewhat like the place where they last fought Sebastian.
Suddenly, Clary heard something behind them. Turning around, she saw another portal opening. Coming through it was Magnus, Simon, a few fairies, and Luke's pack. Coming out last was Jocelyn.
"Mom?", Clary asked.
"I am not going to let my daughter go of into battle without me. I already have a child that half demon. I don't need a dead one too. It's just...Clary, I can't lose you."
Clary felt her eyes begin to water. "You won't."
Her mother pulled her into a tight hug.

"So Magnus, how did you manage to get the fairies to help us?", Alec asked.
"I told them who really killed the Seelie Queen. They were on our side in an instant."
Alec nodded. "I'm sorry."
"What?"
"I'm sorry. I'm sorry that I almost agreed to shorten your life. I've regretted even considering it ever since it happened. Because of it, I lost one of he most important things in my life. You."
"Alexander...I...I missed you. And I'm sorry as well for keeping things from you."
"I missed you too. I love you, Magnus Bane."
"And I love you, Alec Lightwood."

"Simon?"
Simon turned around and saw Isabelle behind him. She wore a dark cloak that was almost the same color of her night black hair.
"Izzy?"
"Yeah. I...I missed you, you know. You mean something to me and I really didn't want to leave you. When this is all over, I hope that we can be real boyfriend and girlfriend."
"Me too, Izzy. Let's just hope we get through this."
He dropped a light kiss onto her cheek.

Clary squeezed Jace's hand as they approached the battlefield. He stopped walking and stood in front of her. He cupped her face with both hands and held it as if it were a delicate piece of china that was about to break into thousands of pieces. He looked at her with his golden eyes and she realized that he must've seen the worried look on her face.
"Hey, what's wrong?", he asked her.
"I'm just worried. All of us will begin fighting, but some of us may not may it out alive."
"Well, I promise, that I will do everything in my power, to make sure we all come back. Here." He leaned in towards her and closed the distance between them.
Seconds or centuries later, they parted, even though she desperately didn't want to.
"What was that for?", she asked.
"Just in case there is no later. I just want you to know that I will always love you."
She looked at him with watery eyes. "I can't think about always, all I can think about is right now. I love you, Jace. I can't lose you."
He looked away for a second and when he looked back, his golden eyes were congruent to her own. "I can't lose you either. You're one of the most important people in my life. I need you."
"You won't lose me. Look, no matter how the day ends, I just want to tell you that no matter what, you are the best choice I ever made."
He kissed her forehead and they began walking again. They held hands as if they were hanging on for dear life.

Across the battlefield, Simon saw them. He saw demons; so many demons. Next to them stood what he had been told were called the Infernal Devices. The person leading the army was none other than Sebastian himself.

Tessa watched in horror as the automatons approached over the hill side. She was having a strong case of deja vu. Her mind kept going back to the first battle she was part of. Looking around, she didn't even really see the Shadowhunters of New York, but of London. She saw Cecily instead of Isabelle, Gabriel instead of Simon, Gideon instead of Alec, she even saw herself where Clary stood, hand in hand with the person that was supposed to be Jace. Her mind was so full of the similarities that she saw Will, her old love Will, where Jace stood. She forced her vision back to the army. Leading them was Sebastian and Jordan. Of course, it wasn't actually Jordan, it was really Mortmain. She watched as everyone around her got their weapons ready. She reached for one of her seraph blades. Sebastian must've given some sort of command because then, hell broke loose. Demons were running left and right. As confident as possible, she joined the Shadowhunters in battle.

Maia leaped into battle. She had transformed into a wolf and was tearing demons until their bodies were nothing but hundreds of shreds. She was avenging him. Avenging Jordan. She wanted to destroy the people that destroyed him. No one would shift her focus. No one.

Sebastian simply watched as Jace walked towards him.
"Ah, Jace Herondale. I just knew that you would want to take care of me personally," Sebastian said.
"Of course. You've destroyed way too much of mine."
"Are we talking about the nine year old or the tutor?"
"Does it matter?"
"Not really." Sebastian got his seraph blade ready.
"I'm not afraid of you anymore Sebastian."
Sebastian scoffed. "You were afraid of me at one point?"
"I was."
"Now you're just making me laugh. I can take you, angel boy."
"And I can take you, demon child."
"Ooo, good one. I'm quaking in fear."
Sebastian stabbed him before he could even flinch.

Tessa watched as Jordan walked towards her. But she knew that it was no longer Jordan that was in that body. It was Mortmain.
"Tessa! Everything okay?", he asked. She rolled her eyes. She knew this was a ruse. She wouldn't play along.
"Give it up. I know that it's you, Mortmain."
He chuckled. "Ah, I must say that I never expected to see Theresa Gray in clothes like that."
He was referring to Isabelle's gear. She looked down at it. It was nothing like the gear of the 1800's; this gear was different, much more fitting for a woman. Sure, it was a bit tighter, but it was much more flexible now. The gear even hugged the curves she didn't even know she had. It was no wonder that Mortmain commented on it.
"I must say that I never expected to see you alive again. Did you decide to return, or did the ground finally tire of your presence after more than a hundred years?", she fired.
"Hmm, you are not the same as I remember. Spending your time with Will Herondale must have taken its toll."
Tessa froze in place. Will was always her weak spot. Mortmain must have noticed.
"Oh, that's right, it has been almost two hundred years since my death. William is long gone. Perhaps if you're lucky, the ground shall tire of him as well." She couldn't reminisce about Will, not now. She couldn't break down.
Stay strong, she heard Will's voice say in her mind. Give him everything you've got and make him sorry for everything he's ever done. Show him what you can really say and do.
She got ready to say what she had been keeping inside all these years. She got ready to fight back. She revealed her seraph blade.
"Heavens!", Mortmain shouted. "Do you even know how to use that?"
"It is no longer 1878, Mortmain. I have evolved from that scared young girl that was kidnapped by the Dark Sisters. I have evolved from that girl that was much too afraid to use her powers. I have trained until my feet have become numb. I have Changed so much my head has spun. I have weld weapons until my hands have bled. I am much more than the girl you first met. I am Theresa Gray no longer."
"Then who are you?"
"I am Tessa Herondale."
She lifted her seraph blade and plunged into the middle of his chest. She stood and watched as he fell lifelessly onto the ground.

Sebastian pulled his sword out of Jace's now dead body. He looked down at the ground again, wanting to be filled with even more satisfaction. But Jace's body no longer lay there. Instead, it was Crystal's. Well, he was still happy even though it wasn't Jace. If he,Jonathan Christopher Morgenstern, had just killed her, Crystal Valentina Morgenstern, then that meant that he had her powers now. He had Crystal's powers.
Looking across the battlefield, he saw Crystal's Victorian equivalent. He reached into his pocket and pulled out the item he needed.

Tessa pulled out the blade encaged in Mortmain's chest.
"Clockwork Prince, your reign has officially come to an end."
"And it is his Clockwork Princess that ends it," said a voice from behind her. No, it couldn't be. This voice was as familiar to her as her own. Mortmain had come back, but did that mean that he could as well? She slowly turned around. Sure enough, it was him. He stood there with his midnight blue eyes and tousled black hair. He was here. Will was here. And that was all that mattered.

The next couple chapters are just going to be about the battle, so be prepared. Trust me, there's a LOT in store for this story. I'm just a little concerned if I'll be able to write it properly. You guys will see why later. So, what do you guys think of the CoHF cover?