Doesn't necessarily have to be a group but tulpas are pretty close in concept except an egregore isn't necessarily always "created" by intention. They can come in to existence unintentionally.
Although, by common definition it is considered to be a group phenomenon, I personally don't quite agree with that yet I would say it is typically the case.
Although, by common definition it is considered to be a group phenomenon, I personally don't quite agree with that yet I would say it is typically the case.