Necromancers
Necromancers are the link between the living and the dead, this world and the world beyond. They are said to "walk in two worlds," or to "see beyond the veil." At their core, necromancers are those who can see, hear and/or communicate with the spirits of those who have passed out of this life, but still linger in this world. It is an innate ability, one which they are born with and that is inherited.1 Some view it as a gift, some as a curse, but it is ever-present in their lives.
While other supernaturals may be able to see 'ghosts', not all ghosts have the knowledge or ability to interact with those that can see them, therefore once they know a Necromancer can see and hear them, they generally communicate only via that Necromancer.
I see dead people…Walking around like regular people. They don't see each other. They only see what they want to see. They don't know they're dead.
— Cole Sears, The Sixth Sense
