Uber Tristram

Uber Tristram is the hardest level in Diablo 2. It is accessed through

Portal to Uber Tristram, crafted by

Recipe: Portal to Uber Tristram, whilst standing in

Harrogath in Hell difficulty.

It is the final area visited on the

Pandemonium Event, and spawns Über

Mephisto, Über

Baal, and

Pandemonium Diablo (not to be confused with Über Diablo).

The area resembles

Tristram. No other monsters spawn on this map.

Number of elite pack spawns:
Normal: 3
Nightmare: 3
Hell: 3

Bosses:

Über Mephisto

Pandemonium Diablo

Über Baal

(despite the game files stating the existence of 3 elite packs (the 3 Ubers in this case) in normal and nightmare difficulty, there is no way to access

Uber Tristram outside of Hell difficulty)