Diablo 4: How to Run the Undercity 

The Undercity of Kurast is infested with hordes of Monsters and some sweet loot for you to collect. In Diablo 4: Vessel of Hatred, the Undercity is a new time-based mode that has you exploring a randomly generated dungeon beneath the city of Kurast. Here you'll slay tons of monsters, complete small objectives to boost your time and loot tiers, and encounter new bossses to reap the rewards. Here's how to run it.