I have found another effective weapon against iron golems

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use arrows or peircing and cast haste on the people that are using them

Re: things to use on iron golems [SPOILER]
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If these have the same characteristics as iron golems in other games I have played, lightning slows them, fire heals them and cold does nothing to them. Of course they cannot be poisoned. I don't recall if magic missiles work at all.
From Baldur's Gate, I found a good strategy is to go through a door or narrow place that the golem cannot follow. Then shoot ranged weapons or run up, hit and run back before he retaliates.

[qu]If these have the same characteristics as iron golems in other games I have played, lightning slows them, fire heals them and cold does nothing to them. Of course they cannot be poisoned. I don't recall if magic missiles work at all.[/qu]
Magic missles heal them in most games I've played, never had one in the few PnP games I have played.

To kill them, you need enchanted weapons, IIRC only +3 or better will work.