Diablo Wiki

An Über boss is a boss monster which is a more difficult, alternate version of one of the regular bosses from the campaign of a Diablo game. The special events and/or locations where Über bosses appear are sometimes called Über events or Über (location). Some sort of unlocking process is generally required to access such bosses. Über Diablo was the first Über boss, featured in Diablo II, which has a total of seven distributed among five separate encounters. Diablo III also has seven Über bosses, with four different encounters.

Über bosses are often encountered in pairs or triplets. The "Über locations" where most appear are alternate forms of regular game areas. The name "Über" does not appear in game, but is used by Blizzard staff to categorize the bosses and explain the events to players. An Über boss may or may not have the same name as its original form, may have a recolored visual model, and may have different abilities.

While Blizzard may provide some lore or flavor for these bosses, they generally are present to provide a high level gameplay challenge, not to be a major part of the plot. Their appearances in Über form may not be canonical to the primary story.

Diablo II[]

Main articles: Über Diablo and Pandemonium Event

Über Diablo was the first Über boss released, appearing in the regular game world. He was followed later by the more complex Pandemonium Event with six new bosses in special unlockable locations. All can be quite challenging; completing the Pandemonium Event may even require specialized builds. Most bosses appear under their original names in-game, but Andariel is reskinned and renamed to represent Lilith. Their abilities and stats are quite enhanced compared to the originals, particularly the Prime Übers.

Diablo II Über bosses, locations and events:

Diablo III[]

Main article: Infernal Machine

Diablo III features Infernal Machines, which unlock one of four Über encounter areas, each containing two or three bosses. These have similar abilities to their original forms, but have different names, for example "The Soul of Evil" for Über Diablo. While they are much more challenging than other bosses at their difficulty level, they can be quite easy for highly geared characters, since they only scale with base difficulty of the game session, with no progression system like Greater Rift ranks. They reward ingredients for Hellfire Rings and Hellfire Amulets.