Collect and use a Vekh'nir Crystal at the Vekh'nir Spell Circle, then return the Charged Vekh'nir Crystal to Dertrok at the Mok'Nathal Village.
The arakkoa of Vekh'nir have been a thorn in our sides for many years. Some strange religion guides them, a religion which has the arakkoa in a frenzy of activity. They carry these crystals with them now, which they have turned to some dark purpose.
I know something of their rituals. They take the crystals to their spell circles to infuse them. We at the village would like to know more. Waylay a few of the arakkoa until you find a crystal, charge it, then return it to me.