Bug expedition or something else

So I encounter a unique or rare during an expedition. The mob had a modifiers that said Minions take dmg before it. So I kill all it minions but dam. I couldn’t even do 1 dmg on it. I ran around the map 3 times. Get out of map go to hideout and return and guess what. It is still kicking my butt. So what is wrong?


I bet he probably dropped some good items if it I was able to kill it.

Drop all augmentation orb or some bullshit white items. 😂