I'm a completest. When I play an RPG, I like to kill all that I can in the way of monsters & all-around baddies. But I have a dilemma. Without spoiling anything for those who haven't gotten this far (but hoping some who have also read this), I'm not strong enough to kill off the Elemental Factions yet (I've tried a couple of them) but I also can't take the quests offered to make them easier because my Paladin becomes Fallen if I accept.

Any suggestions? I almost beat the Water Faction, but that damn Juggernaut if near-impossible at this point in the game.

I think you can go to the next lower level without dealing with the factions, kill some stuff, level up and try again. Wasn't necessary for me, even if I thought I didn't have the levels needed. Turns out my tactics were the main issue, with a better planning it worked out just fine.

Air was the easiest faction for me to tackle. Fire and Water having resistance to fire was a pretty nasty surprise (even if it made all the sense).

Well Earth was actually the easiest, wasn't even counting that...

My strategy which worked pretty smoothly for the Water Faction:

Throw a few webs into the room while you blockade the doorway with your cannon fodder. Just remember not to use anything with fire or you'll lose the web. The bugbears, gargoyles, snakes and priests will slowly make there way into your weapon range and allow themselves to be picked off in ones and twos. Save the Juggernaut till the end and gang up on it. If I recall, blunt weapons worked better than swords. Have a well armored character "use" up it's one attack of opportunity prior to your cleric dashing in with heal spells.

Ice Storm is a very effective AoE spell.

I used variations on this strategy for all of the factions and never did any of their quests...

Good luck.