 However, it is quite possible to create factions that can be used in the default eras, though the amount of blessing given by the creators for each may vary.The stable version of "The Battle for Wesnoth" comes with 16 campaigns, each of which has various difficulty levels.More user-authored campaigns can be obtained in the form of add-ons stored on Wesnoth's campaign server, and these are sometimes mainlined as official campaigns.