Immortals:

Immortals are beings that live forever via magic or a spell cursed on them, or naturally like a lobster. Anyone can become an immortal if they have the right properities, we do not currently know how to create these spells. Immortals do not kill but sort of stand there ominously in the shadows or corner, they don't really have powers and they will always look really old and mystical.

Habitat:

They are all usually stalkers of a good natured person, and will slowly creep behind a tree or something just out of sight at all times. Due to being immortal and being so bored all the time most immortals devote their lives to stalking a really good hearted person.

Weaknesses:

There is nothing you can do about an immortal, unfortunately. If you are being stalked by an immortal the only clear choice of action is to do some really bad stuff like child murder, gambling, peeing in the woods, walking your dog off a leash, etc.