I really love this idea, the problem is that the basic human strength in the game is 8, so that plus whatever strength you when using your 40 points to customize your character, (you can add up to 10 points to a all stats including strength) you will always have strength over 4, plus we are using 20 sided dice here, can I make a change and say you have to roll a 20 (including strength stat) to get it off? So say you have a your a human (8 strength) with a +6 bonus( that is a total of 14 strength) you have to role a 6, because 14+6 equals 20? This is just a recommendation but I do feel it would make a little more sense, but whatever you want, ps, sorry this comment is so long