Guild Wars 2

You also need to put a Superior Rune of the Centaur into your aquabreather´s upgrade slot to get the 6 rune set bonus, as your standard helmet is disabled underwater along with any bonuses from it.

It doesn´t work anywhere at any time I tested it since release.

Since the release of Guild Wars 2, the 6th bonus of the superior set didnt´t work.

Swiftness still gives the standard 33% movement speed bonus.
I have tested this in the Heart of the Mists, with a stopwatch, the rune set with 5 and 6 units complete, and both gave the same run times between measuring points.

My suspicion is that there is a 133% movement speed maximum in this game, and the devs forgot about the rune when they set this hard-cap.

I would really appreciate if ArenaNet would look into this issue, as the runeset would be really nice if it worked.

Tested this recently and experienced the same problem.

Bump so maybe this design oversight will get looked at.