Them fuc*ers in the Temple distr. I killed them the first time around, but that was in Ch6
Im now playing again and have a level 10-11 party with a female kensai katana master and I was wondering when the best time would be to get "my" katana?

Provided you have the right equipment and party combination, level 10~11 should be able to take them down. Magic protection removing spells can help a lot since you are facing more than 3 mages.

You can always save, then go trial and error, just to see how you fair.

Did it with a level 9 party, without a druid too. If you have anyone with a good thaco that can wield the Tuigan bow you can make short work of them. You only fight a cleric and mage if you let them come to you (the third mage stays out of sight).