(XBOX)Magnesium 360

I'm still new and have yet to obtain my first kubrow. However, one of my main goals is to get a helminth kubrow. I read you need to drain a helminth cyst(fully formed) into a kubrow egg. And I read you obtain a kubrow egg from the intro quest for kubrows. So I was gonna save my first egg. But where would I acquire the helminth cyst.