What is the fine-grained topic of the following text: Bethesda promises the dungeon is a challenging one for those who have kept with the game, as it’s balanced to be tackled by two or more level 50+ Vault Dwellers (though Bethesda does not that “brave souls” can tackle it alone). Only return the topic.
Bethesda's challenging dungeon for level 50+ Vault Dwellers in a game.