Warnings

He should have died in that cave in 1979.

When he asked his goblin, Monstro, to take him there, Regulus knew he was heading for death, but like everything else in his life, even death didn't let him choose.

Saved by Monstro, and with great information that could change the course of the war, he has tricks up his sleeve and he's going to use them.

In 1991, he was already a highly respected potions teacher and has been exonerated by the Wizengamot. Everything is going perfectly well until Harry Potter arrives and all the chaos that ensues.

[AU where Regulus Black survives, and takes Severus Snape's place as Potions Professor and all that entails].

Philosopher's Stone [1-17]
Chamber of Secrets [18-41]
Prisioner of Azkaban [42- ]