So I just encountered Mi-Go Slavers for the first time, and that was a really horrible shock.
That psychic scream is so brutally debilitating. My character went from fine to completely crippled by pain and severely injured in moments. I would never have survived if I didn’t have an M4 rifle to just spam rounds into the thing point blank while it shredded me - and even after that the pain lasted for 6-12 hours.
What a terrifying creature.