The Titan Source (Hard mode)

The Titan Source
Section	Ascalon Quests
Campaign	Prophecies
Given by	Vision of Glint in Droknar's Forge (Southern Shiverpeaks)
Preceded by	Defend Denravi (Hard mode), Defend North Kryta Province (Hard mode), and The Last Day Dawns (Hard mode)
Type	Secondary quest
Map(s)
The bosses' location
Alternative route with a closer resurrection shrine

Find and destroy the Titans' source of power to save Tyria.

[edit] Quest information

Travel to Grendich Courthouse and speak with Warmaster Labofski to learn how you can help defend against the Titan threat.
Travel to the northwest region of Dragon's Gullet and kill the 3 Titan bosses.
Return to Vision of Glint for your reward.

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Due to the short distance, it's advised to leave from Yak's Bend for two additional party members. Be sure to talk to Labofski though.
Rebel Yell helps in fighting the Charr during the quest.
Bringing Winter or other forms of cold damage is advised as the Titans have lower armor rating vs cold damage; however, armor-ignoring damage, such as dealt by binding ritual spirits and chaos damage, works too.