Wth was this!!

Okay guys so I forgot to mention this but I havent seen anyone other posts about this thing I found. So y'all know that there are areas where the mobs are lvl20 or higher but it only shows the questionmarks as level. Well I was cruising around like I usualy do and I got the the area with the broken boats (cant remember the area's name) but at the end of the zone u have another path leading even further to a group of hives. Now at first sight this wasn't that weird but as I got closer I heard these weird screams as if a wild animal was near but I couldn't be further from the truth. As I turned around the corner I saw this orb that had expanded, like the size of a hive knight and it shot these swarms that chase u, like a base turret. Before death I managed to aim and read it's name and it was called a Shrieker. Anyone else saw this thing?