<P> In season four , Oliver is called from retirement to help Laurel and Thea stop a group known as `` The Ghosts '' led by Damien Darhk , leader of H.I.V.E. Oliver now goes by the name `` Green Arrow '' , ostensibly a new vigilante following in the footsteps of the Arrow , who Star City ( formerly Starling City ) believes to have died . He plans to propose to Felicity and run for mayor . While on a mission with Barry Allen in Central City , Oliver meets Samantha Clayton 's son , William , and ultimately learns that he is William 's father . Samantha refuses to grant Oliver full access because of his playboy past and her ill feelings toward his mother . The revelations of his fatherhood complicates Oliver 's relationship with Felicity and his duty as Green Arrow , and threatens to jeopardize his mayoral campaign . When a H.I.V.E. attack leaves Felicity permanently paraplegic , Oliver 's fight with Darhk becomes a vendetta . Oliver also discovers that Thea is dying because the Pit 's restorative effect on her is waning ; Nyssa offers a cure in exchange for killing Malcolm . In a fight , Oliver cuts off Malcolm 's left hand and gives the Demon 's Head ring to Nyssa in exchange for the cure . Nyssa disbands the League of Assassins , causing Malcolm to seek vengeance against Oliver . As a result , Darhk kidnaps William , Oliver 's relationship with Felicity becomes estranged , and Oliver is forced to resign from his mayoral campaign . After Darhk is successfully prosecuted , Malcolm , with help from Andy Diggle , aids Darhk 's escape by restoring his magic , and fatally stabs Laurel with Oliver 's arrow . Laurel dies of her injuries moments after admitting that she still loves Oliver , who is devastated . During his quest to stop Darhk , Oliver learns that the pure forces of light can counter Darhk 's powers and that H.I.V.E. plans to rule a post-apocalyptic world . At the end of the season Oliver stops Darhk 's plan to destroy the world and kills him . With the death of the previous mayor , Ruve Adams , Oliver becomes acting mayor of Star City . The season 's flashbacks explore Oliver 's training with A.R.G.U.S. and his infiltration of the Shadowspire organization on Lian Yu . </P>
<P> In season four , Oliver is called from retirement to help Laurel and Thea stop a group known as `` The Ghosts '' led by Damien Darhk , leader of H.I.V.E. Oliver now goes by the name `` Green Arrow '' , ostensibly a new vigilante following in the footsteps of the Arrow , who Star City ( formerly Starling City ) believes to have died . He plans to propose to Felicity and run for mayor . While on a mission with Barry Allen in Central City , Oliver meets Samantha Clayton 's son , William , and ultimately learns that he is William 's father . Samantha refuses to grant Oliver full access because of his playboy past and her ill feelings toward his mother . The revelations of his fatherhood complicates Oliver 's relationship with Felicity and his duty as Green Arrow , and threatens to jeopardize his mayoral campaign . When a H.I.V.E. attack leaves Felicity permanently paraplegic , Oliver 's fight with Darhk becomes a vendetta . Oliver also discovers that Thea is dying because the Pit 's restorative effect on her is waning ; Nyssa offers a cure in exchange for killing Malcolm . In a fight , Oliver cuts off Malcolm 's left hand and gives the Demon 's Head ring to Nyssa in exchange for the cure . Nyssa disbands the League of Assassins , causing Malcolm to seek vengeance against Oliver . As a result , Darhk kidnaps William , Oliver 's relationship with Felicity becomes estranged , and Oliver is forced to resign from his mayoral campaign . After Darhk is successfully prosecuted , Malcolm , with help from Andy Diggle , aids Darhk 's escape by restoring his magic , and fatally stabs Laurel with Oliver 's arrow . Laurel dies of her injuries moments after admitting that she still loves Oliver , who is devastated . During his quest to stop Darhk , Oliver learns that the pure forces of light can counter Darhk 's powers and that H.I.V.E. plans to rule a post-apocalyptic world . At the end of the season Oliver stops Darhk 's plan to destroy the world and kills him . With the death of the previous mayor , Ruve Adams , Oliver becomes acting mayor of Star City . The season 's flashbacks explore Oliver 's training with A.R.G.U.S. and his infiltration of the Shadowspire organization on Lian Yu . </P>
who is the main villain in arrow season 4
who is the main villain in arrow season 4
Damien Darhk
Damien Darhk