Conqueror's Haki is one of the most lethal abilities in the One Piece world that fans have seen over the years. This power was actually introduced in the story before the timeskip, and ever since then, it has been growing greatly in terms of importance. After the timeskip, Conqueror's Haki has been doubly important, and right now, it can be said that it is up there with the most crucial abilities in the arsenal of some of the strongest individuals, such as the Yonko, including Luffy himself.