Apparently the new dark magic lore can reduce a units WS to 0 so that a unit is hit with no dice roll. My question is if you cast something like iceshard blizzard on a unit in combat with them, IRC if the attack does not roll to hit it only works on a 4+. I don't have my rule book on me at work and am not sure if all of the -1 to hit spells only make shooting attacks that do not roll to hit happen on a 4+. On a similar note, is a stat loss stopped at 0? for instance if skinks lost 3 WS and then gained 3 would they have WS 2 or WS 3?