If memory serves me well( and I hope it does
), there are two Stone Golems on the second floor.
One way to deal with them is to get your mages to cast Melf's Minute Meteors( if you do not have this spell, try to purchase the scroll, and if you can't afford it... ... urm... ...) then rest, enabling you to cast it again later on.
I'm assuming your average party level is 7-8.
If you do not possess this spell, then get a +2( or better) enchanted weapon to deal with them.
The Golems are the least of your problems though, the mage you have to fight later on is pretty high level. You might want to reserve some normal weapons to deal with him unless you have 'Pierce Magic' and 'Breach'.
'Secret Word' will not work since he will put up his 'Globe of Invulnerability' which nullifies spells of 4th level and lower. 
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If not a Sorcerer, then a Paladin.
