Armageddon Mode (Game Mode)

Armageddon mode would be a survival based gameplay, made only for the truly worthy of players.  What this game mode would do is:

Reduce player health by 5 hit points.

Always night aside from a 20 minute starting grace period.

Mob health increased by 10. 

Mob Damage is increased by 1.25x Hard Mode.

1.5 times monster spawn rate.

New zombie variants.

And extra achievements/advancements.