+3 = superior rune
+1 = headpiece/helmet/mask/whatever else
In regards to that anyway... +1 could also be a minor, but since the +3 is there, the rune base is covered, so it only leaves the mask.
Yea ... if you want say 12+1+3 axe mastery you put 12 attribute points in axe mastery, buy a Superior Axe Mastery Rune, and then buy the Executioner's helmet which adds +1 to axe mastery. In every class the;y have helmets that do this so just go to the Droks armor dude .. he should have it.