I don't think it's a problem with the sword.
Does the color which displays Lord Xeen stays green all the time or do you manage to get it to yellow when you first hurt him ?
Maybe your characters are not strong enough to hurt him considerably, but a fully buffed level 28 barbarian (thanks to the +10 levels well) should be able to kill him with 2-3 hits with the sword.
If you have "World of Xeen" you can switch between "clouds" and "darkside" anytime you want and can face Lord Xeen even with a level 80 party or so.
You need to kill Lord Xeen in order to get access to the WoX areas, if he's invincible because of a bug you cannot access them after finishing darkside.
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