Just throwing this out there, if I'm late sorry. On the daily heroic version of the dreadnought mission there's a crystal you can scan near the first invisible platforms where the calcium fragment XX "Hive" is located. During patrol you can't scan the crystal but during the heroic you can and it speaks of it holding a hive ready for release by sacrifice. It's also guarded by a few thralls and a sword night in the heroic but nothing in patrol... Just pointing it out... Prolly nothing there... Don't hate...