Ginger

From AoCWiki

Ginger is a Tradeskill Resource used in crafting the alchemical concoctions [Scaled Deathrolls], [Gingerwine], [Veilweb Brew], [Curekill Ale], [Pepperwine], and [Mindflight Draught].

It can be purchased from the vendors in Purple Lotus Swamp, Lacheish Plains, or Poitain.