For the first time in Midnight, Blizzard introduced a Hall of Fame Achievement for solo delvers. Originally granted to 10,000 players, the recent build on the beta makes this achievement a little more exclusive.
Blizzard decided that 10,000 was too many for a Hall of Fame achievement. The requirements for the 
Fabled Let Me Solo Him: Nullaeus achievement are now limited to the first 4,000 players. Players who make it into the Hall of Fame will earn the Fabled Vanquisher of Nullaeus title.
The achievement is now far more exclusive, but that also means the difficulty may vary even more depending on your class and spec.
A common pattern throughout The War Within was that certain bosses were much easier depending on which specialization you played. Restricting this title even more could mean the challenge becomes even tougher for certain classes.
With the introduction of a Hal of Fame achievement for delves, let’s hope Blizzard also improves encounter balance so more specializations stay competitive.
