To defeat the harder Golem Boss that throws exploding monsters at you, have at least five Sand Tanks full. Activate Ravage Of Time (press R, then tap L) and hit him behind his legs (which has no armor). Then, jump on his back and onto his head. Immediately activate Ravage Of Time again so you can hit his head faster. When it wears off, activate Eye Of The Storm (press L), then keep hitting him. You should then finish him off.