gifs: arrow

He’s [Prometheus] not interested in killing Oliver, he’s interested in getting him to break down to the point where he’ll kill himself. That’s been his objective. The other side of that is he really believes and wants Oliver to believe that everybody he’s touched and everybody he loves is going to end up dead or really messed up.
— 

Wendy Mericle to ScreenTV.com [03/21/2017].

Kill himself? That is exactly what Prometheus is going to do. Team Arrow is going to make him see that what he has done is wrong and he’ll then commit suicide, like the character Adrian Chase in the comics.