Daughter of Giants

It is part of the main quest.

Walkthrough
The Soulless One is contacted by the Prophet to meet him in the Harborage to save Lyris Titanborn from Coldharbour. Once the Soulless One is in the Harborage, he will have a dialogue with the Prophet where after he finishes conversing with the player, will open a portal to the Foundry of Woe, which is located in Coldharbour and is where Lyris Titanborn currently trapped in. Throughout the quest, the Soulless One will hear Lyris constantly telling stories of her past before she became one of the Five Companions.
 * Enter Coldharbour
 * Talk to Lyris
 * Advance into the Foundry
 * Settle Lyris' regret
 * Advance into the Foundry
 * Assuage Lyris' solitude
 * Advance into the Foundry
 * Resolve Lyris' uncertainty
 * Talk to Lyris
 * Go to the rock wall
 * Advance into the Foundry
 * Investigate the chamber
 * Advance into the Foundry
 * Vanquish Lyris' terror
 * Escape the Foundry of Woe