In "D&D", dragons are depicted as any of various species of large, intelligent, magical, reptilian beasts, each typically defined by a combination of their demeanor and either the color of their scales or their elemental affinity. For example, a commonly presented species of dragon is the red dragon, which is named for its red scales, and known for its evil and greedy nature, as well as its ability to breathe fire. In the game, dragons are usually adversaries of player characters, and less commonly, allies or helpers. Even though dragons are iconic for the "D&D" game, they are rarely encountered as part of official scenarios due to dragons typically being too powerful for low-level players. An exception to this is the Dragonlance game world.