Magic Forums

So I have a question about the astral beings, I know that a lot of things exist in the astral world but I read somewhere that by thinking of something you give it life in the astral world or create it as an entity (a tulpa for example), I've seen people work with Lovecraft's beings in witchcraft such as Cthulhu and stuff like that and I was wondering if that's just an archetype or an actual entity, if anyone has some info about the astral beings and some list of the entities that inhabit it would be so useful, thanks for reading, blessed be!