I just beat him today. Right after he summons his falls I fell back and regrouped. When i did they had to run to get met(had haste spell going). This allowed me to attack them close to six on one. I had an elemenat (fire) and a shambling mound or two with me. Meanwhile, I cast death fog on the slayer who stayed out of the action. By the time I killed all the minions the slayer had been "unsummonned". I slowly walked around the area and found another slayer. It did not attack immediately so I started summoning everything while casting things like breach, lower resistance and pierce magic. Once he was injured i sent in minsc, valygar and korgan with their big bad weapons. P.S. During the break i resurrected two characters and re-equipped them( why i was not attacked while doing so I do not know)
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