Screamers

Screamers are hideous humanoid monsters that have taken over the Underground. They are capable of producing a shrill psychic scream that can paralyze even the toughest of individuals. They carry mostly blunt weapons but sometimes have lightweight pickaxes and are known to powerattack for a vicious amount of damage (I've seen them hit for 25 through a deathsuit with a razor bat.)

Their screech can be nullified by wearing 2-4 sets of earplugs depending on your endurance. They are also immune to the toxin that fills the air of the lowest levels of the base.

Most people avoid screamers unless they need the kill journal, as their propensity to paralyze you is more trouble than it's worth, and they eat cocoons.