Ok, spoiler for killing Iron and Clay Golems:
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Iron = Fairly easy, just need at least a +2 weapon (I think).
Clay = Much more difficult, can only be harmed by a magical bashing weapon (of any power and type, but must be bashing), are completely immune to all magic, can be harmed by either cold or acid damage (I'm not sure which), but not spells using these damage types. Hope this makes sense
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Nicodemus Deathslayer, Paladin of the Order of the Holy Flame