In Pursuit of the Tierna Harh Cadachtas Walkthrough
Examine the altar at the cave gates. If you have intuition of the second level, you’ll be able to make an assumption. Otherwise, ask your companions. If Siora is not in your squad, go to the nearest camp fire, call all companions and talk to Siora. Talk to Ongos near the Tierna Harh hut and go inside. Examine all evidence – red flowers are the main one. Follow the marker and pick a red flower. Apply its seed to the altar and enter the cave.
Follow the only available route. At the fork, you may shorten the path and go straight if you have enough energy. In the other case, you will have to move to the right. Once you get out of the cave, go forward and to the left. You will find yourself at the battlefield where you’ll be attacked by a new monster. Act the same as with other monsters. The only difference is that the charged attack poisons heroes. If you see a green haze around the monster, just roll back to a safe distance. Look around and interact with Tierna to take the woman to the village. Watch the cutscene that ends the quest.
Reward: 1200 experience points.