how does buffy come back in season 6
Buffy the Vampire Slayer (season 6) At the beginning of season six Willow resurrects Buffy with a powerful spell. Although her friends believe that they have taken her out of Hell, Buffy had actually been in Heaven since her death (a fact that is revealed to her friends later in the season). She is therefore traumatized by her resurrection and this causes her to fall into a deep depression for most of the season.