The Criticals attribute increases your critical hit rate when you
Formula: 1% = x/80 points
For each level you get 5 attribute points, so that would mean 1% critical hit increase ever 16 levels, if you invest them all in criticals.
50% criticals is the max percent criticals can reach, that would be a max of 4000 points in criticals, before the points are rendered useless.
* XP Boost * Gold Boost * Criticals * Reaping * Salvaging * Strength * Lumber Boost * Mine Boost * Defense * Scavenging * Taming