Azeroth Survivors Endless Mode
Endless mode starts after the final boss of a zone dies. You stay in that zone. You do not unlock the next one by lasting longer. The next zone opens only from the kill itself, and only for the class that scored it.
Why stay
More talent experience, more gold, and more time for a build that was already working. It is a poor place to discover that you picked the wrong capstone. If VanCleef was close, endless Elwynn is practice. If Kel’Thuzad just died, endless Naxxramas is a victory lap, not a new guide.
What to bring
The build that cleared the zone. Area and on-death effects get better as the pack grows. A death save you already spent on the final boss is on cooldown. Difficulty can be raised for more experience once the baseline clear is boring. See builds and the first-run rules.