The Opening of the Dark Portal

Beyond this timeway, in the heart of the Black Morass, the Guardian, Medivh, feverishly works to open the Dark Portal, heralding in the age of orcs upon Azeroth. The Infinite have sent their rift lords to stop this from happening. Scattered across the morass, rifts will materialize. Infinite will pour out of the rifts and attempt to destroy Medivh's shields and, ultimately, Medivh. Kill their rift lords and leaders! Do this until Medivh succeeds. Use this chrono-beacon should you require aid.