I'm not to keen on fighting this thing given what happened last time, we are still down a lot of damage in our current situation
What it will come down to will ultimately be to just blast the thing with EMP grenades and our rifles, we need a lot of firepower, so this is no time for holding back. Turning whatever we can into EMP grenades is probably not a bad idea in this situation.
Yulia try to divert it's attention with an illusion then cast: Undermine, Blizzard, Icicle, Fireball and Force Lance, after that it's time to blast it with the rifle
Lri and Maple, you are both speed based so take a hit and run approach as you blast the thing. with your rifles. With your defenses of the suit and your speed you shouldn't get hit. After that just chug EMP grenades at it. No holding back here, losing is not an option.
I think it's very likely that the manager will go for Yulia here, he has to get close to do any damage thanks to the cloak and her non suit status makes her the perfect target. I thus like to use her as bait, to provide both Lri and Maple with an easy target. EMP grenades don't really do much damages to humans, so Yulia will be fine even if she does get hit.