His life has been a cursed existence from being born as son of Layana Stark and Rhaeger Targeryen Aener Targeryen at tower of joy and to living in Winterfell as the bastard son of honourable Ned Stark.
Just before being born Westeros tore itself apart in a civil war that killed thousands and brought down a three hundred years old targeryen dynasty, from his parential family in ruins and being raised as only stain on honourable Ned Stark.
Jon snow grew with weight of the world on his shoulder, he still remembers growing up in Winterfell with his cousin's as their half brother. What he wouldn't give to see them one last time, sparring with Rob and Thoen,
Playing with Arya and Bran, Sansa and lady Stark scorn and haterd.
But they are all gone and he is last one standing.
From being born as a king to living as a bastard then a brother of Nights Watch to theirs commander and then being king of the North, bending the knee to his aunt Daenerys to losing everything to white walkers, he lived and colourful life and now it's coming to an end, he is last one standing.
He never thought he would be standing here alone in Valyria at the end of the world, North fell first then rest of Westeros and Esssos. He has been fighting and fleeing from Night King and it's army for ten years on rheagor,
Dany's last dragon.
Last of its brothers but it to fell when he landed on Valyria. Here he was the last scion of ancient dragonlords, how they must be rolling on their grave but it's a fitting end for last blood of dragon to die on its on term.
He has been standing at the first flame of Valyria deep in its mountain caves standing infront of lava. It is a fitting end to die on his own term and what better way to then to end his life where it's all being of his family.
"Well goodbye everyone and sorry he could not save everyone". With that Jon took a deep breath and jumped into last active lava in the world, he felt nothing as his clothes burned to ashes. As he fell deeper into lava lake he felt nothing but regrets that cut deeper then any pain but as last of consciousness fell he felt an unimaginable pain that tore apart his very soul and the a bright light and then nothing.
Valyria was the most advanced civilization in the world when it fell, it's dragon were but a tip of what valerian were capable of an wonder and horrors and Targeryen were but a minor nobility in it.Doom fell because of one such horror, the most powerful dragonlords families each person was capable of living for a thousand years but it was not enough for them. They wanted to live ten's of thousand or even forever and forever that they devised a ritual with millions of sacrifice with thousand of dragon's for the knowledge.the ritual was so powerful that it Rebeled against its creators and Valyria fell and doom ruled over it but because of the ritual becoming somewhat sentient it form itself into a books which contained all the knowledge of Valyria and it's powers were all sucked into it and after its Valyria doom it waited for someone worthy to wield it's powers ant it remained dorment for centuries waiting for someone to come and claim it all.
When Jon snow fell into lava lake the book of knowledge felt blood of dragon and in an instant it scanned for its worth and found him worthy and bonded with him but with him dying and being last person in the world the artifect quickly thought of a solution that will take majority of its powers and it's sentient but having found a worthy person to wield it's knowledge.its a price it is willing to pay and using all its powers it being to reforge Jon snow and his very being and sending him to time not his own with last of its power.