The Visitor Event Guide/Discussion.

Actually F/P mages are useful in most of the stages in the PQ. But they can't really help out on bosses. If everyone knows what to do, then the PQ is really simple, especially at the bomb stage for an F/P. Mist comes in handy with rooms with a lot of mobs, like in the lights out room. Paralyze/seal/slow is useful in the room with the speedy slippery alien.

One of the ways we did it in the bomb room; first, the F/P mage can poison mist the warrior side while the other party members can concentrate and kill the dex aliens on the other side. Do not kill off the warriors yet until all dex aliens are gone from the other side. By the time all the dex aliens are gone, you can kill all the weakened warriors ones with meteo. Try to do all of this before more mobs gets spawned which is usually at around 3:00 on the timer.

Even though the dex aliens are immune to poison, they can still be poisoned when you cast fire demon on them first. Fire demon makes all resistances and immunities to neutral while making affected mobs weak to ice, so it really just takes an extra step to poison them.

Anyway, when you look at the lv120 PQ, it's not that hard; it just takes a bit of strategizing, good setups, and lots of cooperation for the most part. It's pretty fun once you get the hang of it.