Sheets of icy rain streaked from the dreary sky. Thick blankets of clouds blocked the sun from beaming down its usual warmth. Alicante was normally described as a beautiful, shining city, glimmering with reflected sunlight, but today the City of Glass was gray and dull.

Just outside the city stood a pyre. The mountain of wood bore a single figure. A procession of people clad in white stood around it. Several shed tears, for the loss of a shadowhunter over a century old was not to be taken lightly.

After being a Silent Brother for most of his life, turning mortal again, and then living to an old age, no one could say that James Carstairs' life was too short, but it was.

To one person in particular.

Tessa Starkweather Gray Herondale Carstairs stood at the edge of the pyre, eyes locked on one of the two people she loved most in the world. The warlock had been given special permission to enter Idris, but she would have found a way to get in even if she wasn't allowed. On her wrist gleamed a pearl bracelet, an anniversary gift from Will, and around her neck hung a jade pendant, an engagement present from Jem. Will, who had been dead for more than a hundred years, but it felt like just yesterday, and Jem, who had passed away peacefully in his sleep only last night.

Jem

The name of the sick, silver-haired boy she had met in London, who had played the violin with gentle hands and fought with all the grace of an agile hawk.

The name of the boy she had loved and had been engaged to, who had held her and calmed her in the worst of times, and possessed the kindest soul she had ever known.

The only name she had ever heard Will say with kindness, in the first few months she had known him. The name of his parabatai, whom he had cared for and possessed a unique fondness for.

The name that they were forbidden to use for decades, but that they used anyways, because they knew that Brother Zachariah would always be, in part, their Jem.

Tessa bowed her head. She had told herself that she would not cry here. Not in front of the others who hadn't really known Jem as he was throughout all those long years. Not the way she had. Not the way Will had.

A tall shadowhunter came forward with a ceremonial torch, already ablaze with golden flame. It was only fitting that shadowhunters leave this world in flame, for it was also the color of birth.

Tessa forced her eyes up to Jem's body, and froze for a second.

She must have been mistaken. There was no way, no possible way - But it was. Against his stark white skin, just barely showing underneath his white shirt, was the parabatai rune. It was no longer a faded, silver scar, but a bold, black mark once more.

Tessa's mind shot back to something she had read in the Codex long ago. A line of the sacred parabatai oath.

The angel do so to me, and more also, if aught but death part thee and me.

Jem and Will had been separated for much of their lifetimes. When Jem became a Silent Brother, he had stepped outside of this circle of mortality and life, dividing them. Then, Will had died, and the chasm in between them forced them apart for good.

Or so Tessa had thought.

For the rune that bound them as sworn brothers had blazed up again, and there was no other explanation. Jem and Will were together once more. They had crossed the river of death, to where the immortal warlock could not follow. The two people she loved most were reunited in a distant land she could not reach, and the pain of that realization was unbearable.

Tessa buried her face in her hands, and pearl clinked against jade. The almost 200 year old girl finally allowed herself to cry, as the silvery smoke drifted away over the green hills. 

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Okay. I read a headcanon about this and I had some feelings so I decided to write a fanfic. Yes, another fanfic. Keep reading for Magnus' chapter!