Nephilim

It's quite hard to find these characters, as they only spawn in a rare mini-biome that only has a chance to spawn in sky portals. If you're looking to get one, it's advised you scour every sky portal you get.

Combat
Nephilim only gain support skills and their stats are focused on mana and Magic. Also they are not able to equip a weapon, gaining a second misc slot instead. This relegates them to a supporting role in combat. However it should be noted they deal True damage that ignores types, terrain and Armor, so if they get Telekinetic on them they can become quite dangerous.