What do you mean there is no water in December?

Dragons can't function without water in October, November and December of the lunar calendar. Without proper conditions or environment, even talented people can hardly exert their talents. Similarly, heroes can't show their abilities or functions. This sentence emphasizes the important influence of environment on individuals by depicting the image that dragons can't function in dry winter. Even if you have excellent talent, it is difficult to display your talent without suitable conditions and opportunities.