I’m currently running the game but I have a Whisper rolled up in case one of the PCs is out of commission (jail, overindulgence, etc) in which case that player will take over DM duties for the duration. I already have this planned as a long-term project
Spirit Field: a generator which uses electroplasmic energy to cause distortions in the ghost field. This affects any spirits in the area, making it more difficult for them to see any living creatures within a few metres of the device. I figured level 3 because it’d be a duration of a few minutes, covering an area the size of a small room, and would only be moderate force. Downsides are that it’s fairly bulky, it requires a vial of spirit essence per use, and if a spirit does manage to see through the distortion it has no protective capabilities at all. In fact the distortion may anger the spirit further.
Hope I get the chance to build and use it one day!