<P> After Emma and Hook are dragged into Zelena's time portal, she accepts Storybrooke as her home, regaining her magic to re-open the portal to the present where she begins a relationship with Hook . However, unaware to her, she also brings a previously deceased Maid Marian to the future which ruins Regina's happiness, having not heeded the warning of messing with the past . Elsa, who was trapped in an urn, was also brought to Storybrooke by the time portal . While working with Elsa, who helps Emma to finally embrace and control her powers, Emma helps her new friend find her sister and return home while balancing the threat of the Snow Queen against her friends and family . After a period of peace, Emma begins to help Regina on her quest to find the Author of Henry's book . Cruella De Vil and Ursula soon come into town resurrecting Maleficent and working with Rumplestiltskin to find the Author of the magical tome Once Upon a Time . After Cruella De Vil threatens to kill Henry, Emma kills her, soon after learning of her parents' actions of removing Emma's potential for darkness by putting black magic within Maleficent's daughter and Emma's childhood friend Lily . After Emma returns to town, with the encouragement from Hook, she chooses to forgive her parents and let go of her anger . In moments before the finale, Emma is able to finally let her walls down and tells Hook she loves him . Emma then chooses to sacrifice herself for the town of Storybrooke, asking her parents and Hook to save her, she voluntarily plunges the dagger into the Darkness, transforming into the new Dark One . </P> <P> Emma searches for Merlin and is helped by a manifestation of Rumplestiltskin, who wants to teach her to be the Dark One, while Emma attempts to resist becoming evil at the same time . Sometime later, she transformed Hook into a second Dark One to save his life . Hook then cast the Dark Curse to get back to Storybrooke to have his revenge on Mr. Gold . Emma then altered the curse, adding a dream - catcher in it to wipe out everyone's memories of their time in Camelot . </P> <P> Six weeks later, the rest of her friends returned to Storybrooke, but with a horrifying and shocking twist, their memories were wiped out once again and wearing Arthurian attires . As it turned out Emma made an appearance as the Dark One, with her new attire . Henry asks what happened to her, and she told them that they all went to Camelot to remove the darkness from her and they all failed (except Henry). Emma with her powers turned Sneezy into stone, proclaiming that there's no savior in the town . Emma surprisingly gave the Dark One dagger to Regina with the intention that if she goes too dark Regina would be the only one that would willingly "put her down ." Shortly after this, Hook attempts true love's kiss with Emma in the hopes that the Dark One's curse would break, but ultimately failed, as Emma has fully embraced the darkness . Unbeknownst to the others, Emma currently has possession of the Excalibur in a locked room inside of her new house . She intends to make Excalibur and the Dark One's dagger whole again, as with it she will be able to snuff out the light forever and become invulnerable . However, she must recruit a hero to do so, as she cannot remove the sword; the hero she chooses is her predecessor Rumplestiltskin, who she tells finally has a chance to become a hero . She planned to siphon the darkness out of both of them and put it Zelena, who she forced into an accelerated labor to avoid killing Robin's child, and slay her . She regains her memories of what Hook plans, by resurrecting all the Dark Ones as part of his revenge . At first, Emma plans to absorb all the darkness inside her and kill herself . Things do not go according to plan when Hook steals it from her . Killian orders her to kill him, taking in all the darkness and Emma slays him with Excalibur while the darkness is removed from her, reverting to her old self . After blackmailing Mr. Gold for tricking her and Hook into making him the Dark One again, she and her friends and family descend into the Underworld to find Hook and plans to split her heart in half and share it with him like her parents . </P> <P> Arriving in the Underworld, Emma is contacted by Neal Cassidy, who warns to turn back, advice Emma chooses to ignore . She and the others later discover that the Underworld is for those with unfinished business, and they decide to help others move on, while they search for Hook . With the help of Hook's ex-girlfriend Milah, Emma manages to retrieve Hook from Hades's captivity . However, she is unable to split her heart, as Hades has decided that she, Regina, and Snow are to remain behind for freeing the souls of Prince Henry, Hercules, and Megara . It is discovered that the only way they would have a chance to return to the "Overworld" with Hook is by overthrowing Hades . In order to defeat Hades, Emma and Hook receive help from Hook's brother Liam; however, it is soon discovered that Liam betrayed them after being blackmailed by Hades . Fortunately, Henry agrees to help undo Liam's work by using his powers as the Author . Later, when Emma and Hook try to perform the heartsplit, they are informed by Hades that Hook's body has been dead for too long and is decaying, making him unable to come back to life . When Emma and Hook go into the depths of the Underworld to find ambrosia, something that would save Hook, they are faced with a True Love test, which they pass when Emma chooses Hook over her own heart, only to realize that Hades had tricked them and destroyed the ambrosia, and Hook tells Emma to leave him in the Underworld, as time is running out for her to go through the open portal . Emma objects, saying that she came to the Underworld to save Hook, and she wasn't leaving without him . Hook eventually gets her to say her goodbyes and she does, only to find out that Hades had trapped her and her family in the library using magic . Emma and Regina work together to use their own magic to counteract it . They all go through the portal, and while Emma has second thoughts about leaving Hook, she is persuaded to go by her father . When they get back to Storybrooke, Zelena is informed by Regina and Robin that Hades tried to trap them in the Underworld, but she brushes off the information and is upset with her sister . She talks to Hades about having the life she wants, which is just a simple picket fence life . However, Hades wants a whole kingdom . Robin and Regina break into the mayor's house, where Zelena and Hades are, trying to get Robin's daughter back from Zelena . Emma, distraught and unable to grieve Hook's death, tries to break down the protection spell surrounding the house, but Zelena uses her magic to stop her . Hades is about to use the Olympian Crystal to "end" Regina, but Robin steps in front of her, taking the blow, which kills him . Hades tries to pressure Zelena into killing Regina, but she stabs Hades instead . </P>

When does emma stop being the dark one