Board Thread:Questions and Answers Forum/@comment-24171394-20150210125832

I was doing a story mission or a strike, and came across an enemy which seemed to be worshiping something on its own. When disturbed by myself it attacked me and it was literally immune to everything I could throw at it in terms of guns, grenades and special ability. I was just wondering if anyone else has encountered something like this and could shed some light on what it was? 