Finish Gift of the Bow, then start A Trial of Archery with Glyndwr in Vernworth.
Rescue Doireann from the Ogre in the Ancestral Chamber.
Speak with Taliesin to complete the quest and receive the Portcrystal.
Rewards for Monster Culling, Trial of Archery and the main quest Feast of Deception each include one. Another rests in the Forested Griffin's Nest in the Misty Marshes, west of Vernworth and northeast of Checkpoint Rest Town, tucked beneath the Griffin if it is asleep, and a chest in Darkhorde Cave holds one more. The Dragonforged at the Bay Wayside Shrine, north of Bakbattahl, also sells one.
Portcrystal Map Location and Quest Guide
A Trial of Archery is a side quest given by Glyndwr in Vernworth. It begins on talking to Glyndwr outside Roderick's Smithy once Gift of the Bow is complete. A Portcrystal is part of the reward for saving Doireann.
Meet Glyndwr at the campsite marked on the map, southwest of Melve.
Escort Glyndwr to his home in the Sacred Arbor and fight the monsters along the road.
Reach the Arborist's Home. Taliesin calls off the trial, because an Ogre has taken Glyndwr's sister, Doireann.
Leave the Sacred Arbor by the way in from Malachite Forest and head east. Follow the white-painted torches and take the wooden bridge down to the lower ground.
Join Glyndwr at the marked spot, then enter the Ancestral Chamber.
Clear the monsters room by room. The white torches lead the way through the chamber.
Turn right at the large doorway to find a corner chest holding the Ring of Percipience, then take the left path to Doireann.
Wait for Glyndwr's arrow to make the Ogre drop Doireann. Grab her, carry her clear of the fight and set her down somewhere safe.
Return and defeat the Ogre. Glyndwr then opens a shortcut out of the chamber.
Carry Doireann out of the Ancestral Chamber.
Speak with Taliesin to complete the quest.
Talk to Taliesin once more to receive the Hunter's Secret. The tome teaches the Archer skill Heavenly Shot to the Arisen and the main pawn.
Rewards: 2,800 XP, 16,000 G, Repeller Bow and Portcrystal.
