Harry Potter: I Became a Black in the Founders' Era

[Harry Potter fanfiction + Founders' Era + Slytherin + No Romance + Everyone's Favorite + Research Buff] Don't start reading. I lost the manuscript and don't plan to finish it for now.

In 1881, 12 Grimmauld Place in London welcomed its second young master, Phineas Black II.

Phineas, a Harry Potter lore buff in his previous life, was quite pleased with his new identity: magic was real, he was handsome, wealthy, and well-connected, his father was the headmaster, and once he got into Hogwarts, he could do as he pleased. He could even be classmates with Dumbledore...

Warnings

1. No Romance here means readers can ship whoever they like. Relationships are very important, including but not limited to one-sided love triangles. This is for readers with eclectic tastes. GGAD will not be broken up or reversed!

2. The protagonist's golden finger is knowing the plot. He has just one ultimate goal: to change the “Pyrrhic victory where both sides go down together.”