Symbol of Swiftness
From Guild Wars 2 Wiki
“Sear a mystic symbol into the target area, damaging foes and granting swiftness to allies.
— In-game description [?]
- Each pulse applies the listed duration of swiftness to allies (including self) that do not already have swiftness. Allies that already have swiftness (whether from an earlier pulse or another source) only receive 1 additional second of swiftness per pulse (though this 1 second is still increased by Boon Duration).