We already know what Strength Eaters do: They are mental shapeshifters that take on the form of the strongest thing you can imagine.
We helped Nico kill one.
Not quite. This is what she said during that event:
Nico "Obviously. One of our agents was clearing out a den in here, she was a second class, like you. But she was killed in action by something else, our scanners identified it as an A rank."
You "....What kind of monster are we talking about?"
Nico "An M:43. A type of shapeshifter."
===
Nico "And to answer your other question, no, it's not a shapeshifter like you."
Nico "This thing doesn't work with flesh and bone like you do, it works with concepts, thoughts, feelings... Memories. Immaterial bullshit like that."
Nico "It can only transform into something you know. Something you've imagined maybe, or someone you've met. Whatever it can dig out of your head."
show nicob an with dissolve
Nico "Which makes them a pain in the fucking ass to fight for anyone who's fought someone worth a damn. Because it can take the form of your toughest opponents."
Nico "If I'm unlucky, it'll be Malik that pops out of that thing and I'll have to fight that flaming asshole."
You "Shit... Will it be as strong as he is?"
show nicob nt with dissolve
Nico "For a time. But it's limited by its own pool of energy, so trying to use Malik's more powerful moves will likely just kill it quickly."
show nicob sigh with dissolve
Nico "I'll outlast it even if it fights conservatively, but it'll be a fucking pain in the ass. Which is why you're here."
show bmc s flip with dissolve
You "Me?"
show nicob nt with dissolve
Nico "Yeah. Monsters like this,
or Strength Eaters are more dangerous the more powerful you are. Which is why we don't send people like me in first."
==
It was not a Strength Eater itself, but it does share a danger level to the strong ones. Good catch on that.
. 
