It's about a HarmonyOS pearl or the pearl of chaos that killed 400,000 people. What novel is it because the protagonist of that pearl has crossed the world of repairing truth?

This is "Shen Xiu", full of wind and clouds.

Shen Xiu is a classical Xian Xia online novel written by Feng Xianyun, serialized at the starting point. The work tells the story of Chu Yi, a famous architect and grave robber, who came to Xuanyuanxing, a planet controlled by practitioners, under the guidance of Zuqiu.

Unwilling to be ordinary, he started as a humble miner just for an opportunity to set foot on the road of cultivating truth ... I am the supreme Yang Xuan, and I don't cultivate true immortals and ancient gods. Chu Yi was transported across the starry sky to a world of true practitioners because of the change of family heirlooms. Unwilling to be ordinary, he started as a humble miner, just for an opportunity to embark on the road of truth.