Available at level 30. Can be started by entering the Harborage.
Quick walk through below:*** Spoiler - click to reveal ***Enter the Harborage
Talk to Varen
Choose your companion (Talk to Lyris or Abnur)
Wait for Varen to open the portal
Enter Halls of Torment
Explore the Halls of Torment
Defeat Tharn doppelganger
Talk to your companion
Continue through the Halls of Torment
Find a way to destroy Lyris' shield (Destroy the shielding stones by jumping up on their level)
Defeat the Lyris doppelganger
Talk to your companion
Continue through the Halls
Defeat Sai's torturers
Free Sai Sahan
Talk to Sai Sahan
Return to the Harborage
Talk to Varen
Talk to Sai Sahan