Are there any hints or help for this area other than "equip a magic resistant shield" and "roll like an acrobat having a seizure"?
Aside from what has already been said, if you're a mage/cleric, bring Binoculars. With proper stats, a Great Lightning Spear kills the casters in one.
The most difficult part using this strategy is the final section of the second area, where there's two melee guys and a spellcaster clumped together. The melee duo will aggro the instant you attack them and it can be difficult to hit them at range, so you need a tactic to take them down two-on-one. Keep in mind that they will outrun you in the shallow water, so it's advised to aggro them in an area that's out of the water..
I never had much trouble in that part for some reason. If you kill the caster near to the ramp first you won't aggro the meleeguys, and if you then kill the remaining caster fast enough, you'll only have melee to deal with for that part. Obviously different in NG+, but still.