One sword in the world.

According to the official website of Codename Breaking Dawn, we can see that the plot music is called Tianyi Sword and was sung by Weng Yuanyou.

The new game of "Honor of Kings" is codenamed Dawn. The secret of the ancient miracle gem "Heart of Dawn" is hidden in the star lantern of Jixia Academy. Destiny led the hero to open the long-dusted door of Chang'an, and the power of dawn shook the continent of kings.