The Truth Will Out

You'll start by heading towards the House of the Pythia, which is marked on your world map west of the Sanctuary of Delphi. Before you go, make sure to clear out any unwanted gear you've accumulated from fighting cultists.

Once you arrive near the Oracle's location, deploy Ikaros to scout the area. You'll spot several guards protecting the property. Tag them all so you know their positions.

Your goal is to get inside without raising too much alarm, so prioritize stealthy assassination kills on the guards. If a guard is just out of reach, you can try whistling to lure them closer for an easier takedown.

There's also a mercenary guarding the Pythia. Save them for last, as they can't be taken down with a single assassination. If the mercenary spots you before you've dealt with the other guards, let them come to you and try to lure them away from the house to fight them separately.

Warning: If the mercenary uses fire weapons, be extremely cautious. Their attacks are dangerous, so focus on evading and retaliating. After a successful dodge, unleash a combo of heavy and light attacks until they prepare to strike again. Your bow is also very effective against them from a safe distance, especially with headshots and special abilities.

If you get hit by a fire attack and don't have adrenaline to heal, quickly find cover and wait for your health to regenerate before re-engaging.

After you've defeated all the guards and the mercenary, enter the house and interact with the door to trigger a cutscene. Then, speak with the Pythia to progress the quest.