From Guild Wars 2 Wiki
Experimental Remnant is a consumable item that can be purchased from Rakkan in Cursed Shore.“Double-click to consume.
Nourishment (10 m): 50% to Gain Swiftness on Kill
+4% Damage While Moving
+10% Experience from Kills
— In-game description
|Rakkan||Winterknell Shore||Cursed Shore||1 28|