Clary was dead, she had died right in front of Jaces eyes and he couldn't save her, his mind travelled back to that moment as he lay in the dark staring up at the ceiling
Jaces eyes opened and he took in his surroundings, he was in an abandoned factory, surrounded by demons, in the middle of the space was a throne decorated with skulls and flowers and on that throne sat Sebastion Morgenstern, he heard a muffled cry behind him and spun around to see Clary, her hands were bound like his and her fiery hair hung low on her shoulders, he met her eyes and he could tell she was terrified
"Well,well, my dearest sister and her annoying boyfriend, how have you been?" Jace turned back around to see Sebastion smiling down at them, he kneeled in front of him and Jace spat in face
"Feisty as usual, but come on, that's just digusting" he said wiping it off with his jackets sleeve, he made his way over to Clary and she kicked out at him, hitting his feet, causing him to fall to the ground, she smirked, obviously proud of her work, Sebastion glared at her, standing up and walking back over to his throne, he pointed to one of his demons, beckoning it forward
"Bring her to me, and you two hold him still" he said pointing to two other disgusting demons, they approached Jace and held him back by his shoulders as the original demon dragged Clary in front of Sebastion, she whimpered as it threw her down hard and Jace growled
"My dear sister, Clarissa, you see I don't want to kill you, but it's the only simple way to get what I want" he shrugged as if he hadn't just said he was going to kill his own sister, Clary flinched back, desperate to get away as Sebastion drew his sword and balanced it against her chest, Jace struggled against the demons, not ready to let the love of his life die in front of him, he pulled free and many things happened all at once, Sebastion drove the sword into Clarys chest and she screamed as he twisted the blade, Jace fell back as a portal opened up in front of him and out poured dozens of shadowhunters including Alec, Izzy and Simon, all he could do was stare at Clarys limp form lying on the ground willing her to be alive, he crawled over to her, begging her to wake up, but it was pointless she was dead.
Jace was crying hysterically, as he remembered the events of that day, he hated himself for not being able to save her, and the worst part was, that he knew it would have hurt, that she didn't die peacefully, but Painfully and alone.