The Dragon Slayer

Start The Dragon Slayer: Complete 'A Warden's Best Friend'. Choose to repel a dragon attack in Treviso ('On Deadly Wings') or Minrathous ('On Blighted Wings'). Finish those quests, then talk to Solas and Harding to begin 'Completing the Veilguard'. The quest 'The Dragon Slayer' will then start. Fast travel to the Rivain Coast.

Talk to Allies: Speak with Solas, who suggests finding a dragon expert. Then, confer with Harding, who will find a dragon slayer for you.

Reach Dragon Beach: Meet your prospective dragon slayer. Fight Antaam, including those with cannons, in an arena. Note the ruins entrance to the southeast. Before entering, climb a northeast ledge for the note 'Dragon’s Breath and the Antaam Schism'. Then, head northwest, go upstairs, circle to the southern wall, and destroy crates to find a small chest with the 'Light Guard Helm' cosmetic.

Navigate the Ruins: Enter the ruins and turn southwest to find a chest. Kick down a door to the southeast, sidle across a narrow ledge, exit into daylight, and ride a zipline northwest. Loot a small chest and destroy an explosive barrel for a shortcut back into the ruins. Ride the zipline back, enter the ruins via stairs near a crane, jump over a collapsed wall, and continue southeast through a cave, sliding down a slope to reach Dragon Beach.

Defeat Deepstalkers: Upon sliding down the slope, Deepstalkers will spawn, including a Deepstalker Matriarch. Defeat them and loot the Matriarch for the 'Scorch rune'.

Bait the Dragon: Head north, climb a ladder, jump a gap, and climb another ladder northeast. Blow the horn to trigger a scene.

Reach the Grey Warden Fort: Climb ledges north and kick down a door. Continue north, climb waterfall ledges to an eastern ledge, and find a small chest with the 'Skull Display' decor. Drop down, climb a ledge south, jump to a stone ledge, and cross a tree to reach the Clifftops.

Solve the Statue Puzzle: Find a gate to the north and alcoves with statues east of it. Enter a building south, descend a ladder, smash a barricade and barrels north, and find three statues. Rotate them: Left statue facing east, Center statue facing west, Right statue facing north. This lowers a ladder. Climb it and loot the large chest. The gate will also raise.

Enter Warden Castle: Drop back down, ascend stairs east, and use a zipline to cross a gap east to reach Warden Castle.

Search the Fort: Head east up stairs, then south to find two doorways. Go west, pass through doorways to a gap. Loot a chest and kick down a beam for a shortcut to the Clifftops.

Clear the Chamber: Enter the fort, continue south to a large chamber. Kill Antaam, including a cannoneer. Note stairs west leading to a drakestone-blocked doorway (return later). Take the 'Spellcaster’s Stiletto' from the cannoneer. Continue up stairs south and go through a door west.