Wolny Duch (ang. Free Spirit; łac. anima) are spirits that, for whatever reason, choose to live and exist in the Sixth World rather than their home metaplane. Almost all kinds of spirits can be free spirits (notable exceptions include Ancestor Spirits and Watcher Spirits). They often have powers far beyond those of summoned spirits. Some free spirits choose to emulate metahumanity, while others take forms more alien.