Before starting this quest you can click on the "Sourcestone Crate" for a five minute buff to damage, health, and resistances. Head south following the road and kill the five Specteral Harvesters and three Endless Dominators you come across until your objective is complete. Be wary of the Endless Dominators as they are aggressive and will attack without provocation.
Follow the road as it turns to the west and turn the quest into Asha Catari.