Guild Wars 2

I have prepared all the item to make Potion of Ascalonian Mages. But when i mix Pile of Glittering Dust, Jug of Water, Destroyer Sliver
it can’t craft together, still lack of 1 item. May i know what going on? Is that the ingredient changed? My Artificer full level.

You learn it from a buyable recipe.
http://wiki.guildwars2.com/wiki/Recipe:_Ascalon_Ghost_Potion

Hi Preyar, thank you for your information. Noted.