I noticed that in one of the Let's Plays, on the character sheet, when the number of attributes for a weapon (slashing, necromantic, etc.) fills up the entire length of the bar, it simply tacks on another bar with graphics of scotch tape and everything! Awesome. But when I reached this threshold myself, to my disappointment, there was no tape, only a measly +2 on the end of the bar, and no way to tell what these attributes are! Argh!
+2 -> the bonus damage you get from your melee skill (red fist skill in the stats grid) I believe it is raw damage that can be reduced by armor, but of no particular 'type' (so no resistances to it)
that +2 is from the "Melee Power" stat, not from your damage indicator overflowing. http://dungeonsofdredmor.wikia.com/wiki/Melee_Power
