Admittedly I found this to be one of the toughest battles of the game.
But, with a little trial and error, I finally figured out a method to beat them.
Similarly to what SixOfSpades mentioned about having your party run like hell, I would recomend starting out the battle with all of your "defensively weak" party members waiting down a hallway and have your one or two best tanks do most of the dirty work.
Also, I would add that your primary fighter/tank should not only wear the 'Boots of Speed', but should also be hastened and equiped with back-up 'Potions of Speed'.
Maybe you already you this but your character will absolutely fly by the seat of his/her trousers and if I remember rightly, he/she will actually look blurry.
It is also imparative that you load any and all potions and offensive/defensive enhancing spells onto your main tank(s).
Oh course if you really want to be smart/cheesey, do what Six recomended, where you lead these Warders on a "wild goose" chase until their powerful self-enhancing spells wear off, then go in and engage them.
But again, I would recomend that you experiment for yourself through trial and error, it will make you feel like you really accomplished something. Good Luck!
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\"The Earth is NOT your Mother!\"<br /><br />\"The chief cause of failure is trading what we want most, for what we want at the moment.\"<br />-Unknown
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