Defeat Alia, Kurast’s End
Head inside, find each portal as quickly as you can, then fight Alia in the boss stage. She’ll cause a ring of either green or red energy to encircle you during the fight, then spawn waves of those same colors.
Run through the hazard that matches the circle around you to avoid taking damage. Keep it up and kill her to complete the quest, then head outside and speak to Sihek by the Undercity entrance again.
