The Lycanite Mobs mods for 1.6.2 adds new mobs to the nether from Doom. These evil mobs are all aggressive and can be killed for their resources.
Small demons that shoot fireballs. Although they are relatively weak, they often travel in groups.
Behemoths are huge demons that throw balls of hellfire. They are very strong but rare. You can flee them by hiding somewhere with a low ceiling as they are two blocks tall.
Hellfire burns longer than regular fire and has a green tinge. Upon death, Behemoths drop Hellfire Charges which can be used to light Hellfire on blocks much like a Fire Charge. They can also be used in...