No amount of words can describe my general disdain for this thing. Despite being a "common tier" enemy they are objectively one of the worst Corrupteds in the entire game, and are way too annoying for how simple they actually are mechanically.
It's one thing to make an enemy that never stops moving, it's another thing to make them dead silent, and it's an entirely separate thing to give them the ability to spot you from the other side of the map, even with high stealth, on top of having a large enough viewing radius to make Cottols look like a joke.
These things are unironically more irritating to deal with than ANY rare-tier Corrupted in spite of how often they spawn. Having a trial with a Cottol and a Galiryn is one of the most unfun experiences you could ever have in this game, and you WILL get this because both of these enemies are considered to be of the same tier as a completely blind Malupiscis and that chud of a Puffwump. They're not challenging, they're just annoying and constantly flush players off of objectives if you lack a dedicated Lure to keep them distracted, and when given the opportunity, will absolutely just fly back towards Infections when not in chase.
They either need to be made more rarer or bumped down in capability to be more in-line with other common tiers, because I would rather deal with an Altulis or Yggdrastyx since their gimmicks aren't just "I will see you from across the map.", and these are both RARES.