Genius of the Damar Clan 2

In my home world, I was a battle mage and the commander of a special-operations squad. There I died in combat, shielding my men from the blast of a magical landmine.

Here I was reborn in the body of a young genius of a clan. Lucky? I doubt it. Otherwise why is the entire family of the boy dead, and why is the clan doing nothing? And what’s clearly wrong with the genius’s power, too?