So I was deep in waste looking for horses when i saw moments. I had very good stuff, so I was going to avoid him. When I turned the other way, there was another momentus! I was surprised that he hadn't drawn me in because I was so close. I was stuck. I just went sideways to try to avoid both of them until....of course... a marlix shows up. I had a bed with me, so I set my spawn so I could try to get my stuff. I was stuck again. Then, I just tried to shoot momentus so that I could at least try. When he drew me in, I died, and he made those deep holes that he makes whenever he kills you. I died 2 more times, until i just rushed in with a stone axe and no armor. He drew me in and i fell into the deep hole that he made. There was a little cave inside the hole that I went into. Then a message "This monster has trouble getting to you" showed up. I kept hitting him, and killed him with a stone axe and no amor! I got all my stuff, until ANOTHER marlix showed up... Fortunately, this one was farther away, so I could avoid it. All in all though, there were two momentus' and two marlix in one spot .
If you don't hit a Momentous they won't attack. I've literally walked straight through them fine. Not sure if the same applies to Marlix's.
It depends on your difficulty setting what the momentus will do. If this happens to you again I will have your back buddy. Just give me a heads up.
It has before though... hmmm.. maybe I wasn't on 5 before. For a while, I was on 7, but I don't remember seeing momentus on 7. I am positive it has sucked me in when i haven't done anything though