After the First Omnic Crisis, the androids were defeated and the world returned to its peaceful times. However, rumours of a even greater threat channeled under the surface of the planet. With increasing unknown terror attacks and mass murders being carried out daily, the UN seemed powerless to resist. The long disbanded Overwatch must take action and they will not be a single army

After the bloody Second Demacian-Noxus War, the world of Valoran finally experienced a brief period of peace. Demacia and Noxus; Piltover and Zuan managed to shape a weak armistice while Ionia watched over the hardly- forged equilibrium. However, a dark mist starts to loom over the continent as a new threat began to surge below the deep tides. Valoran will face its final battle.