
Each of the Diablo 4 Unique items are powerful pieces of gear you can get in the game, enhancing your class abilities, or providing strong secondary effects. But with great power comes a greatly decreased drop rate. It's fairly rare to wrangle one of these before reaching the endgame. And it's even more rare to find one of the eight "Uber Unique" items.
The only guaranteed way to get a Unique item is to beat Blizzard's par time in The Gauntlet, a weekly dungeon with a time limit and leaderboards. If you are fast enough to earn the Seal of the Worthy (which isn't hard at level 100), the cache you receive the following week will have a 100% chance to include a Unique item.