Board Thread:Arrow discussions/@comment-171.249.167.186-20151210120629/@comment-84.82.3.120-20151225120105

Damien Darhk's powers are useless against Thea and Sara, who were both exposed to the Lazarus Pit. So anyone who has been exposed to the Lazarus Pit could defeat Darhk.

So probably either Thea or Sara will defeat him, and since Sara will be in Legends of Tomorrow, that seems highly unlikely. So probably Thea, unless someone else uses the Lazarus Pit.