You traveled to The Temple of Lagon to speak with Lagon directly and obtain his blessing for the Lance of Heorot. Despite Architect Liath's warnings, you made your way inside the temple at the bottom of the sea.
After exploring the temple, you ran into Architect Liath. You tried to reason with her a final time, but she tried to stop you. After defeating her, you found a portal to even further below the ocean's surface.
Lagon rose from the depths and challenged you to entertain him. When you survived his trial, Lagon granted you his blessing and opened a portal that returned you to Thetima.
In Thetima, you met back up with Grael and Yulia and told them of your success. The Lance needs one more blessing and it will be ready.
Grael will travel overland, recruiting the villages along the coast into an army to oppose Rahyeh. You and Yulia will take a ship south to reach Maj'Elka for the final blessing of the goddess Majasa.