Genius of the Damar Clan 3

In my home world, I was a combat mage, the commander of a special forces squad. There I died in battle—covering my guys from an explosion of a magical mine.

Here I was reborn in the body of a young genius of a clan. Lucky? I doubt it. Otherwise, why is the whole family of the boy killed, and the clan does nothing? And what’s clearly off about the genius’s power?