There are 2 golem type. Stabber and smasher. Both have an aoe attack, and a quicker attack that can be parried for a generous stun. Smasher aoe is coming when it raises both arms. Dodge. If just its left arm goes up this is what you parry. Use iron mace combo or power attack. The stabber one has a spiky arm, if he does a big torso twist wind up get ready to dodge the aoe. When he pulls back his spiky arm for a thrust this is what you parry on him. Smack em up. Upgraded iron buckler parries them just fine.