You know, I heard a lot about specializations and stuff in 1999 mode
What happened?
1999 mode, as of halfway into the game or so, all it is is just a higher difficulty.
Enemies heal fully on death, and you take more damage.
The twist is, you lose the same amount each death, and it doesn't scale the lower or higher you have. If you can't pay for respawn, you have to start the entire game over.