Sapphire in the Wasteland

The tyrant Malak wants an endless supply of water, and he sends General Kael to capture the siren princess Sira so she can lead him to its source. Kael takes her and they travel together. Along the way the hostility between them turns into something else. Sira tells him what Malak did: he killed her people and sealed off the water source because he was after immortality. Kael stops believing in the man he serves and joins the rebellion at Sira's side. The rebellion is beaten. Afterwards Sira gathers the Salt Crystal Warriors, the Phantom Flame Warhorses and the Yinglong dragon and takes that army against Malak, breaks open the water source, and becomes Queen of the sirens.