The (6) bonus doesn’t work. I’ve tested this with 4-5 stacks of might with the elementalist’s Pyromancer’s Puissance trait (XII) that grants might with each fire spell cast. I used the golems in sPvP lobby, a steady weapon and auto-attacked with fireball for a constant time (till their death).
Then I put on the boots to complete the 6-set, but the damage didn’t change (testing with the boots on first then without didn’t change a thing). Tested on a medium golem to eliminate errors from rounding. Maybe it only applies to the might that is granted by the bonus (4). I haven’t tested that.
To eliminate the influence of the trait, as they can be really buggy, I also refunded my traits and tested it with the might from Glyph of Elemental Harmony and the same setup as above. Doesn’t work. Completely removing every piece of gear with the rune and reequiping them also didn’t work.
On a related note, while the (2) bonus works, the extra duration isn’t reflected in the tooltip for Glyph of elemental harmony, although the duration is increased on use.
Quick link:
http://wiki.guildwars2.com/wiki/Rune_of_Strength
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