Possible spoiler...
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If you don't want to know what i did, don't read any further.
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Let him kill himself...I used my lvl 5 rogue/10 assassin/5 shadowdancer, and the arcane spell *off of a scroll* wounding whispers, which does 1d6+1 per caster lvl of sonic damage to attackers that hit you, and the +2 astral blade, and 12 heal potions, lol. I cast ghostly visage, and shadow evade, for lower chance of being hit/dmg reduction, and got busy. Only died about 4 times, but the golem was doing 11 and 12 pts of dmg to himself. We died at the same time on the last round of his life, but he was dead.