Yes Mr Underhill, that is essentially it. Don't bother with it until BG2. I don't, and I'm sure others have given up trying. As for the "damage", the effect of the Turn is to sever the link between the Prime Material Plane (this one) and the Negative Material Plane from which all undead draw their particular status. Thus, you don't need to cause incremental damage, instead have divine aid to cause the disruption between the natural/unnatural link.
Or so they tell me.
