At launch, Diablo 4 features Capstone Dungeons, these were more challenging dungeons added and were gateways to progression in the game. These were removed after Season 6 when the difficultly system was overhauled.
Capstone Dungeons were readded to the game in Season 11 as follows:
Torrid Menagerie
- Suggested level: 30
- Difficulty Tier: Normal
Hellish Descent
- Suggested level: 50
- Difficulty Tier: Expert
Unseen Awakening
- Suggested level: 60
- Difficulty Tier: Torment I
Tempest Oasis
- Suggested level: 60
- Difficulty Tier: Torment II
Sins of the Many
- Suggested level: 60
- Difficulty Tier: Torment III