In Strum Pull the first two groups you see and run towards the back of the first room, get that group and kite them around in the first room til they die. If using an Engi, use oil bomb and damage over time will kill em as you kite. If cleric -- kite, smite like mad, kite a bit, smite, heal, and the likes.
Century: You only pull the mobs from that first portion of the room. There's a spot for clerics to stand in to make it easier to smite, unfortunately, I don't know this. Hopefully someone can help you with this one.
In Sturm, there is a small mushroom spot next to the portal where, you as a cleric/mage, can run to for safety, it allows you to smite in a majority safety, but you can still be attacked as they can get back there too the same way you do.
In Century, as you first enter, if you stand behind the wall that pokes out to the right, you're safer there than you would be standing in the open.
I can take some screen shots if need be to so you know where to stand.