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Title: Diablo IV - Cathedral of Light Capstone Dungeon
Description:
In Diablo IV only the first two difficulties (world tier levels) are available right from the beginning. A higher world tier promises more experience and better loot. To reach higher world tiers you have to complete a so-called "Capstone Dungeon". The capstone dungeon for world tier 3 (Nightmare) is the "Cathedral of Light" located in Kyovashad. This dungeon becomes available after finishing the main story and should be completed as fast as possible to get more experience and better loot. The capstone dungeons are a bit different than normal dungeons, because enemies in the capstone dungeons have a fixed level that doesn't scale with the players level. If you can finish a capstone dungeon you should be strong enough for the next world tier level.

Link: https://www.digioso.com/d4_cathedral_of_light