Skill understanding

What do you mean Heaven's Hammer is Holy Elemental? Does its damage dealing capability depend on something entirely different (such as MaxHP -1) and not traditionally attached to your damage range? You can infuse elements to it for side-effects (freeze, for example), but I don't understand the part of it being Holy.

About mastery, my bad, no wonder I Drk's mastery only went up to 85%, I thought something was wrong on the Weapon mastery skill.

And 160% isn't 1.6x.

Thanks though, I couldn't have worked out all those mumbojumbo alone.