Throne of Shadows Starting with the Baron's Son

I was reborn as the son of a baron, but my life was worse than that of a servant. My stepmother didn't give me food or drink, and made me sleep in a stable, sweep dung piles, and chop firewood. They united with the church and planned to formally disinherit me at the council meeting. But that day, I activated the system. ——Kill the enemy to gain a hundred times proficiency. The steward sent by my stepmother to humiliate me was smashed into a pulp by me with a shackle. My father's old steel sword is steadier than anything else in my hand. Behind the cracked wooden shield stood an entire military camp of soldiers. They asked me if I dared to swear to the goddess. I said, I don't swear. I trust you with my life. Later someone asked me, why is it so bad? I said, I just inherited what I deserved.