ok i haven’t done one yet so here’s a lesson on spirits and demons from me, your friendly local witch and exorcist
there are several types of spirits! some never had a body and are tied to the land (nature spirits and the like) these are fine to talk to usually. just use caution
however spirits who had a body now exist in sort of a limbo state. as time goes on they lose themselves more and more and become single minded in the pursuit of finding a body to inhabit.
where do they get a body? from idiots who think its fun to summon spirits! yes, that’s right, kids, through no fault of your own, 90% of spirits you summon want you out of your body so they can have it. sure, there are rites and precautions, but don’t risk it.
now then. demons. demons are different. they dont want your body, they want your soul. more to the point, they are expert tricksters and use any means necessary to get you to essentially sign over your soul to them. and sure, you might get a sweet mortal existence out of it, but it’s usually something that turns sour as time goes on
what do they want your soul for? power. that’s about it. all deities want souls signed over to them for power, but some (read: gods) are a lot better about keeping them
as for summoning satan, don’t even try. this guy goes where he wants, and usually only appears when black magic witches summon him (because power!)
anyway. demons and spirits can both fuck your life up, don’t summon them. just do not do it at all. ever.