A Dornish Threat
Guess who's in charge down in sunny Dorne? Ellaria Sand and her cadre of sand snakes. But she still has revenge on her mind, so one big season-seven plot we're dying to see is Ellaria and Olenna Tyrell coming after Cersei to avenge their dead loved ones.
Plus, Ellaria needs to leave Dorne in order to meet up with Yara Greyjoy.