Monsters like Tarrasque, Aspect of Tiamat, and Bahamut offer challenging encounters with high CR ratings in D&D. A creature's challenge rating is the Dungeon Master's indication of how difficult a ...
and one that worked with Wizards of the Coast on D&D 5e adventure Hoard of the Dragon Queen and Rise of Tiamat (D&D 5E: Tyranny of Dragons, as it's called today). And while their docket is ...