strategy... maybe someone doesn't want to know, so SPOILER
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Uhg, those lousy mindflayers. I'm in Ch. 3 right now, and i just beat them yesterday. I had tried in a previous game, but i ended up not likeing my main character too much. So i'm playing a mage/theif now. Myself and mazzy tore up the mind flayers in the sewer by ourselves almost. It was a matter of setting traps, opening doors, and running

then mazzy launched some phantom arrows into them. But the theif traps worked wonders. three traps in a hallway filled with mind flayers, run, close the door and watch the damage rack up. Also, it seems you can rest and get more traps to set while the other traps are still deployed. Mad insane damage to the beasties!