Wraiths and items that interact with them

[DreamCarver]

Maybe wraiths could summon those npc spirits that attack you.

Give janitor a vacuum that can store things and turn spirits into ectoplasm so the crew can play ghostbusters.

The addition of something like the vampire's bats for the wraith sounds like a good time. Mass panic seems to be something that wraith is really missing. It's just one target at a time, hope they get knocked down, eat their body.