Neurovirus
Minecraft now features a new danger - neuroviruses that can either completely destroy you or make you invulnerable. Infections are transmitted through various means: contact with infected mobs, due to lack of sleep and poor nutrition, and in rare cases - through prolonged stay deep underground or at high altitudes.
Mod Features
All types of neuroviruses are curable. Positive viruses that provide beneficial effects can only be obtained from special mobs that are significantly more complex than regular enemies.
The mod is in active development. The latest update 1.0.0 added neurosphere to the game.