[Grojlach]

I have a question regarding the Never's Tomb Quest; one of the artifacts can only be achieved by defeating 4 flying swords, but either I'm using the wrong tactics or I'm simply of a too low level to deal with them properly (level 5 fighter/level 1 rogue, with the Barbarian as my henchman). But now I'm wondering whether I have to wrap this quest up before going to the ritual chamber or not, I'm not sure if I'll be able to return to this tomb later on in the game... Do you have to finish all quests before going into the ritual chamber (you know, right after you've given Lady Aribeth the fourth component) or will you get a chance to finish several quests (including the Never's Tomb Quest) later on in the game?
And if you can't return later on, what kind of tactics did people use to defeat those swords?