In all nine lives he had lived, Klaus never once succeeded in saving any of the Starlights. They all died, some right before his eyes, while others he never even got to meet.
Hanna died during the Renegade Era by exploding her core to buy time for him and his mother to escape. In the end, his mother had to do the same. Luckily, he escaped successfully.
However, during the Blood Era, he met her, and they even conversed a few times. He had no idea who she was, just as she had no idea who Klaus was back then.
It was only then that he realized he had lost someone extremely important to him. She was the key to accessing one of the Paragon Stars, yet she died before he could get to know her.
That left a deep scar, leading him to go berserk during the Blood War.
The Heavens Court even regretted coming after him. But by then, it was already too late. He had killed close to a million warriors, sending the rest running with their tails tucked between their legs.
