Ghosts.
A being that is dead, considered to be a representation of some dead person's soul.
There are many different kinds like the tricky poltergeist, the icy cryogeist , and the generic spirit.
They often can pass straight through things, however, some can not, as they are more powerful, and they are powerful enough to manifest in a physical form.
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Demons, Ghouls, and Ghosts. A Users Guide.
ParanormalA Small Book meant for @AshTrash669 Here ya go.