I my adventure the other day the party ran up against a Stone Golem. I thought it would be a challenge for them, but it was easy. A simple grease spell and some summoned monsters (meat shields) was all that was needed to neutralize the golem for several rounds while the fighter, with an adamanite battle axe, beat it down. Should I have played the golem “smart” and had it use all its attacks against the only guy doing damage to it?