The infernal mob mod for Minecraft adds rare mobs imbued with special abilities and buffs. The difficult of the mob is heavily increased, but so too, are the rewards for defeating them as they grant four times the experience and a random enchanted item is dropped. The mobs are broken into three groups based on difficulty: rare, ultra, and infernal.
For experienced player, the infernal mobs mod raises the overall difficulty and produces a more challenging experience by spawning mobs with special abilities like 1UP, twin, undying, among others. It is a high-risk, high-reward mod that geared towards seasoned players.