Transmigrated as a Useless Prince: I Built a Thunderclap Bomb from the Start

He wakes up to find he has transmigrated into the useless younger brother of the Empress. To prove himself, he makes gunpowder in ancient times to drive back the enemy. Fortunately, he has divine weapons to help him. After transmigrating, he finds a divine mirror of karma beneath his pillow. The more people’s fates each of his actions can change, the stronger the mirror’s spiritual power becomes. So he makes thunder-cracking bombs by hand and blows up the Khitan supply lines. The explosions earn him authority, and bring peace to the nation. When the capital’s former laughingstock becomes a pillar of the state, his Empress sister finally asks, “Who are you, really?”