Invincible breach monster

There are some mobs named like "it that crawls" that seem to be invincible.
I start the breach last on the map and have quite the stack of HH buffs and they simply take 0 damage, are way faster than me and kill me with 2-3 hits.

wtf are those?

ah and they apparently dont get stunned or damaged when you use ailiths spells

annyoing af, dont know how many times I died to those little shits (they are hard to see as well)

Edit: and sometimes, they are invisible as well

Just stopping to say I just experienced the same thing in a breach hive. Eventually every single monster became invincible. It started with a couple of them being invisible and slowly increased as the waves progressed. kinda frustrating.

I just encountered 3 named It That Shreds in Beach map. They're unkillable and invisible. They did a lot of damage to my 96 deadeye but barely scratched my 92 RF Chieftain. I avoided them by dropping a portal by the boss room then I kited them to the far end of the map and logged to character select then back into the game. Nothing could damage them even my RF or fire traps. These mobs need to be removed from the game.