Although there are exceptions, most lwa have names deriving from the Fon and Yoruba languages. New lwa are nevertheless added to the pantheon. It is for instance believed that some Vodou priests and priestesses become lwa upon their deaths, and that some objects used as talismans become lwa. Vodouists often refer to the lwa residing in "Guinea", but this is not intended as a precise geographical location. Many lwa are also understood to live under the water, at the bottom of the sea or in rivers.