Occasionally, you will find an Elite Mob out in the world. These are buffed versions of vanilla mobs, with there being 4 types of Elite Mob, each having their own unique ability. They have a very low spawn rate, and can spawn anywhere taking the place of it’s vanilla counterpart.
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Elite Mobs will drop the following on death:

An Infernal Zombie on the Overworld surface.
Infernal elite types are arguably the most dangerous variant type there is. They are surrounded by an aura of orange and blue flames, and going inside that range will result in you being cooked alive. It's best to use a ranged weapon against Infernal enemies. If you don't have a ranged weapons, you might want to try a fire resistance potion.
Slimy elite types are the least dangerous elite type as of right now. Slimy elite types will spawn 4 "Slimy Slimes" upon death, who do not split up into smaller slimes and drop no slimeballs. They can be identified by green slime particles surrounding them.
Overclocked elite types have an aura of blue particles around them, similar to a Sharpness sword. Upon spotting you, they will fire a slow moving electric orb at you, repeating every couple seconds. If the orb touches you, you'll get struck by lightning and take some serious damage.
Hyper elite types are another somewhat dangerous elite type. The Hyper elites only ability is the ability to move FAST. They can be identified by sparkles near their feet.