The winds of nature... it wasn't anything truly special. It's just the plain wind felt everywhere one went. The thing extraordinary about it was the Imperial Xu's capability to wield it. No other imperial families could have the power to command the wind as they please but the Imperial Xu. Some people had the misconception that the Imperial Xu could wield all elements that it was just the wind.
Whenever they waved the waters, blow the fire bigger, or break off parts of the earth; they made use of the wind that would go gentle or brazen with just a mental command from them. Even if their father god wasn't an original god, they managed to retain a godlike ability that made it possible for them to rise through the charts of strongest imperial human families.
