Blood and Fire, One Source: I, Son of Gedeng

"HP + GGAD, System, slow burn, original character"

"On a rainy, black night in 1926, the phoenix birthmark on a baby inside a magic circle in Godric's Hollow faded to ash on the seventh day. In New York in 1976, a boy opened his eyes amid the ruins of a magical menagerie. A bronze mark on his wrist crackled with electricity: 'Bloodline System bound. Detected: Host carries a bloodline resonance between the White Wizard and the Dark Lord.'

Elliott Gray remembered being torn apart in his previous life, Dumbledore's tears falling onto the back of his hand, Grindelwald's spell piercing his heart. They said, 'For the greater good,' but forgot that he was part of that 'good' too.

Now, among the fragments of memory unlocked by the System, Albus in the apple orchard hides lemon sherbets for 'the child of the future,' while Gellert in the dungeon carves Albus's name into the wall with a blood pact. A vortex of scarlet and blue flames burns in Elliott's palm. He can soothe an Obscurus until it curls up like a cat in his arms, and make Fawkes spread his wings of rebirth for him.

The countdown to the final duel of 1945 ticks away in the System. Dumbledore gazes at the vision of three figures in the Mirror of Erised and sighs. Grindelwald smiles at him through the iron bars. 'Little phoenix, pass this message on for me: Albus, I regret burning that unsent letter.'

When the boy stands between the two of them, lifting the nearly shattered blood pact with his mutated flames, he finally understands: the so-called 'Lifeweaving' curse was never meant to erase him. It was two madmen spending a century weaving for him a life called 'parents'"