Traumagenic refers to a system caused by trauma while endogenic refers to a system caused by something other than trauma. You may find people often say endogenic systems aren't real, but there are some in existence. Traumagenic systems are obvious from which they stem, they come from trauma, but endogenic systems have a range, they can come from other disorders or tulpamancy. Tulpamancy when referring to systems is when one makes an alter on purpose, this can only happen in endogenic systems and is something that can cause an endogenic system, that is part of why many don't like endogenic systems, but many overlook the fact that some are caused by other disorders. An example could be a system caused by schizophrenia, you may initially assume it's all part of the psychotic symptoms experienced, but if once medicated the system stays, it makes you an endogenic system. Your system remains but was caused by something other than trauma, you're still a system, just not the broadly accepted type. And no, you cannot be born a system. That is never something that can happen. I do not encourage or endorse making yourself a system through tulpamancy, but I do not provide snide comments or rudeness to those who are endogenic, and you shouldn't either. It's just a different kind of system, don't gatekeep a disorder.