I recommend Army Crusher to you. It was a fantasy novel. The main character's strength dropped and became a cripple, but he met the goddess and picked up a daughter. He had a cheat that allowed him to get a skill book. He could learn it with a single hit and he could also borrow the power of the stars. It was called Army Breaker. The small fry teased his sister and was sent flying! In the end, he recovered his strength and defeated a God of Creation. I hope you like my recommendation, Mwah ~π