As one of the five new bosses in Diablo 4, Duriel, King of Maggots, will allow players to farm Uber Unique items for the first time in Season 2. Like the Echo of Lilith, players will be able to face Duriel at level 100, and with every victory, they will always have an opportunity to win an Uber Unique.
Diablo 4 does not guarantee that Uber Uniques will drop every time you defeat Duriel. If you are looking for a guaranteed way to earn these items, you will still have a hard time doing so. In the entire game, Uber Uniques can only be obtained through battles with Duriel. For everything else, you’ll have to win the lottery to get them.