Bront said:Technicaly, though saying it this way means that someone with a con of 6 could potentialy not get the benifit of the feat at a given level if he rolls low enough.
But we don't roll HP in LEW -- and the lowest anybody can get is the equivalent of rolling 3. Since our point-but scheme doesn't allow any -3 modifiers, there is absolutely no functional difference between this feat and Improved Toughness (except prerequisites).