Round 1:
Tanus launches his flurry of blows at the golem, striking four times thanks to Martan's magical speed enhancement. Unfortunately, not one of his strikes is able to harm the golem; its exterior is just too strong.
Vandon strikes repeatedly with his mindblade, landing two blows which cause further harm to the golem (21 damage).
Martan launches his Orb of Electricity, and it strikes true, sending showers of sparks arcing across the construct's iron surface. Strangely, it doesn't seem that the golem has been harmed by the orb, but its movements now are noticeably slower.
The golem now has risen to its feet, and, slowed by Martan's spell attack, ponderously raises its sword for a single strike at Vandon. The blow strikes true, wounding Vandon (19 damage). The warrior also feels the blade's poison(!) working through his system, but he is able to shrug off the effects for now.
Silence casts prayer, filling the adventurers with the benefit of her faith in Pelor. The iron golem seems indifferent to the spell.
All PCs regain 1 hp due to Silence's Mass Lesser Vigor spell (hp Totals: Silence 63/74, Vandon 100/125, Martan 46/61, Tanus 64/64).
End round 1, Actions for Round 2?
(OOC: If Insight is not able to respond for the next few days, I'd be happy to accept ideas from the rest of you far Tanus' combat actions. Otherwise, he'll continue to make melee attacks...but, as you've seen, that hasn't been very effective so far.)
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Tanus: 4 attacks w/ Flurry of Blows (+11/+11/+11/+6, incl. Flanking bonus, Haste bonus, Combat Expertise penalty); Roll 13,1,10,10; Totals: 24(Miss), Auto Miss, 21(Miss), 16(Miss).
Vandon: Full Attack (+22/+22/+7, incl. Flanking bonus, Haste bonus); Roll 20,18,10; Totals: Auto Hit (constructs immune to critical hits), 40(Hit), 17(Miss). Damage Rolls: 4+8, 1+8 = 21 Total.
Martan casts Empowered Orb of Electricity (+7 ranged touch incl. Haste bonus, Firing into Melee penalty); Roll 20; Auto Hit. Golem takes no damage, but is slowed.
Golem attacks Vandon: Roll 5 vs. AC 28 (incl. Vandon's Haste bonus); Hit! (incl. Slow penalty); Damage Total = 19; Vandon initial FORT Save vs. Poison, Roll 10+14=24 (Succeeds).
Silence casts Prayer (PCs gain bonuses, but golem not subject to penalties).