As a special enemy, it seems to be the only one that is severely lacking in hints to the player, both visually and audibly.
All of the other special enemies are either visually distinctive, such as having parts of their bodies that emit light significantly, or having obvious sound cues when they appear and act.
Visually, its body has no glowing parts at all, and in a dimly lit game environment, it’s hard to spot it, and soundly, it doesn’t run like another enemy throwing a fire grenade, which makes a unique sound at any time.
I’ve also noticed that when it appears, there is no sound, or even if it did, it was too difficult to hear, and I tried to watch it fight carefully in the solo mod, and each time it show up when I wasn’t even aware of it.
It can blend almost completely into normal enemies and environments without being noticed.
The only noticeable sound cue I can notice is the unique sound effect of the gas grenade after it is thrown but it’s often too late, and he moves his position very quickly. And poison gas will block the view at the same time.
There’s also its AI, which often throws poison gas out of your field of vision, such as resting on walls and obstacles, when it’s already hard to detect.
Finally, there’s the issue of poison gas, which is the only enemy attack that doesn’t damage its allies, and also blocks your view for a long time, quickly cutting your shield, and I’ve noticed that enemies in the gas have a brief glow in their eyes, it may even provide buffs to enemies.
As a special enemy, it has too many advantages and too few hints, which makes its existence very unbalanced.
It’s not that it’s hard to beat, it’s just that it’s very uneven and tiresome.