Guild Wars 2

The trait should give you +15% movement speed as long as you have a dagger equipped.

I tested with a stop-watch and double-checked against using Signet of Air (+10 speed) with the result, that, dagger or not, this trait does not change your movement speed at all.

Indeed. nor does One with Air seem to work. And there is absolutely no indication of the speed. Why not have a stacking book showing on the boons list?

Just did some stop-watch testing with “One With Air” as well, and it seems bugged to me, also. It does nothing to up the 10% speed increase already gained from “Zephyr’s Speed”.

It should either stack for 35% or override for 25% I guess…

Same result here, just reset my traits to find out that windborne dagger seems not to work. I changed from daggers to staff and back while autorunning and no change noticed. Also seems not to apply to speed during combat.