Another theme could be loyalty. Since it's related to the emperor, there might be characters who are loyal to the emperor or the idea of the imperial power symbolized by the sword. There could also be those who oppose it, creating conflict. And perhaps the theme of destiny. The sword might be tied to a certain destiny, either for the empire or for the characters involved with it.
One similar manhwa could be 'Tower of God'. It has an intricate world - building with different levels and powers, much like 'the sword of the emperor' might have. Another is 'Solo Leveling' which features a protagonist growing in power in a fantasy world. And 'The Beginning After The End' also has elements of a character evolving in a complex, magical setting.
In 'a piece of sword' manhwa, the story centers around a character's determination to find the fabled sword. They face numerous obstacles and have to overcome them using their skills and wits. The plot is full of excitement and unexpected twists.
The 'Chaos Emperor' manhwa has an exciting story filled with adventure and fantasy. It attracts readers with its unique characters and immersive world-building.
In 'A Night with the Emperor' manhwa, the story centers around a chance meeting at night between a commoner and the emperor. This leads to a series of events involving palace politics, forbidden love, and the characters' growth. The plot is rich with emotional ups and downs and keeps readers on the edge of their seats.