This is the first quest in the erudite racial quest series. It is given by Vess Al'Ishni in Stonestair Byway.
You must gather five Fe'lein Herbs. These herbs are ground spawn throughout the zone.
Once you have all five you must head to the scribe shop and use the mortar & pestle there to crush them. It is found at -48.17, 0.32, -59 .
Finally return to Vess Al'Ishni to open up the Tweezing Kerra quest.