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HuggyTurtles A tulpa is a thoughtform and a step up from a servitor. You concentrate your energy and thoughts to create a being that can interact with you, help you through tough times, be a companion, and if they're mature enough they can leave the host (the creator) and go exploring. People who sense them are usually people who can sense spirits. But tulpas are always good since they're meant to be friends, not enemies. They can also communicate with spirits since thoughtforms and spirits are both made of pure energy (as in, they're both non-physical beings so they can chat with one another if they choose to).
A servitor is the same thing but it doesn't form a mind or personality of it's own. It is only to help you with whatever you made it for and nothing more, no fun conversations or companionship with it, like a programmed robot. That's boring so I opted for creating two tulpas.
Anyway, that part about them visiting you was a joke. I'm pretty sure what you saw was actually a spirit. And yeah, you should avoid that place since there's no telling if it's benevolent or malicious.