| They are pretty tough. Usually I show myself and agro a few of his henchman then run away. Then I kite the henchman with attack fade/potion tactics. Then show again and kill more henchman. Repeat until the boss is alone. Continue to use hit and fade/regroup until he eventually goes down since he has no healing.
If you just bull rush the main guy the mechae archer henchman supplement his damage too much so that you are just running around dying.
With nature/spirit you might try the same. Lure the henchman away to come and fight with your army (or perhaps since summons are weak in normal you just have a Lich??). Then pop a point in ether lord once you have boss alone and rush him with your bosskiller summon.
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Beware the fritters and the fish!
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