Undead Hunters are usually Aasimar or Paladins (or sometimes both). Their main goal is to cleanse any areas tainted by undead. They are usually quite skilled at what they do. They can sense good and evil just like Paladins regardless of their class, and are also immune to disease at higher levels. These abilities are less powerful than they would be if they were a paladin, however. They can only sense good and evil once every three days, and are immune to disease at level seven. If their class is paladin, however, they gain these abilities at the normal level for paladins and can use them however often it says in their class description. This particular version of the background is quite rare, since characters with this background are always kids. They cannot be older than 12. Characters with this background cannot be warlocks, barbarians or rogues. They cannot be any version of evil, so don't make their alignment chaotic evil, neutral evil or lawful evil. Neutral is okay, and Neutral good is okay, but I'd recommend lawful good or chaotic good.