So, unless we take out the directive we will have to keep dealing with this kind of stuff right?
That's definitely less then ideal and a first as far as floor monsters go. I still think leaving one of the floor monster alive might be the way to break the cycle but I don't think we have that luxury here.
On the bright side, material farming!
Alright, Yulia's magic will be not particularly useful here, but with the suit on we couldn't cast Identify, which could be really crippling.
Still, we have a few spells that should do some damage.
We definitely want to make use of a illusion to distract some of them.
Then Yulia can cast Force Lance and undermine, after that she can take her rifle and start sniping at the enemy.
Lri and Maple should take advantage of their speed and go for hit and run tactics. Since they are pretty much immune to magic the only danger is getting to close to the enemy, so as long as distance is maintained this shouldn't be an issue.
We also might as well use an EMP grenade, or hell, since we get four more plates out of this fight, let's use two. The big guy seems to be pretty scary if Maple is to be believed. And we are still at a very critical juncture here.
Take out the predators first and then focus on the big guy.