Enter the cave through the entrance at ( -4, -57, 224 ) /waypoint -4, -57, 224. Once in the cave, head towards the kidnapped Priestess of Growth (Esthella Evenheart), who is at ( 69, -94, 327 ) /waypoint 69, -94, 327. There are several level 58 ^^^ heroic aggro shamblers along the way (none of which sees invis) and Esthella will be guarded by either Malagate (59^^^) or its placeholder, (a crystalline construct). Speak to Esthella Evenheart to get the update.
Return to Eva for your reward.
Completing this quest gives +7500 faction with Tunare