Defeat Ketheric Thorm

Defeat Ketheric Thorm is a quest in Chapter Two of Baldur's Gate 3. It can be started by completing Infiltrate Moonrise Towers.

Objectives

• Follow Ketheric.
  • We battled Ketheric Thorm. Before we could finish him, he fled somewhere below the tower. We need to follow him.
• Escape Balthazar's lab.
  • Ketheric learned that the weapon he's searching for and the artefact we carry are one and the same. We've been teleported to a laboratory where Balthazar plans to remove us from the artefact's protection. We need to escape.
• Search the Colony for Ketheric.
  • We pursued Ketheric beneath the tower and found ourselves in what appears to be a mind flayer colony. We need to find him.
  • We escaped Balthazar's laboratory and found ourselves in a mind flayer colony. We need to search for Ketheric.
• Kill Ketheric Thorm.
  • We found Ketheric, along with a Bhaalist named Orin and a Banite called Gortash. They brandished a triad of magical stones that seem to give them control over an illithid elder brain. Orin and Gortash have taken the brain to Baldur's Gate aboard a nautiloid - leaving Ketheric to face us.
• Obtain Ketheric Thorm's Netherstone.
  • Close to death, Ketheric transformed into an apostle of the dark deity Myrkul - and was defeated all the same. We should search his body for the stone he used to control the elder brain.
• The gem we found on Ketheric's body is a Netherstone - one of three used to control the elder brain. Orin and Gortash carry the other two. If we want to cure ourselves and save the Sword Coast, we'll have to hunt the pair through Baldur's Gate and claim each of their Netherstones in turn.