Finish the To the Edge of the Abyss quest and consume an Infernal Compass to start the Infernal Hordes mode in Diablo 4. There are two major quest lines that you can complete while Season 5 is active ...

Infernal Hordes allows players to take on waves of enemies either solo or in a group. Each successive wave gets slightly harder. Before starting an Infernal Horde, you will spend an item called an ...