Spirits

Spirits (Also called ghosts) are nonphysical materializations of the souls of the deceased. A Spirit of a deceased person that, for some reason or another, was unable to pass on to the next life, or whose rest had been disturbed. Ghosts are neither good nor evil, as their behavior is ultimately dictated by who they were in life and how they died.

Powers and Abilities
Spirits currently possess the abilities below.

Invisibility - Spirits are imperceptible to the visual spectrum, but if they are angry and vengeful enough, they will be seen.

Inangibility - Being dead, spirits are intangible and can phase through things and objects.

Superhuman strength - The strength of a spirit is much better than they were alive, as such, they can overpower mortals with no difficulty.

Supernatural detection - After death, Spirits can see naturally invisible beings, such as reapers.

Telekinesis - Despite being able to physically touch things, they can move objects with their mind in the physical world.

Teleportation - Spirits can transport from one location to the other in a instant.

Weaknesses
Spiritual exorcism - Spirits can be permanently banished from the physical world to the spiritual world with the use of a spiritual exorcism.

Oliver Kalcidus - Oliver can banish spirits permanently with a touch, just like a spiritual exorcism. However he must concentrate and cannot be weak to do so.

Iron - Spirits are vulnerable to iron. They can placed out of there vessels, can be seen, harmed and physically injured by iron.

Salt - Salt can be used to prevent a spirit from entering a place.