How to complete The Path Infernal, the collaboration event with Final Fantasy XVI.
Requirements
To participate in the special event, you need to reach level 50 and complete the main scenario quest "The Ultimate Weapon" (the final A Realm Reborn Main Scenario Quest).
Where to Start the Event
Go to Ul'dah and use an Aetheryte Shard to go to the Ul'dah Aetheryte Plaza if you aren't already there. Go southeast through the hallway, then go southwest and look for the Neophyte Adventurer across from the Hall of Flames. Talk to him to accept the quest "A Land on Fire".
A Land on Fire
Say Yes when asked about your identity. There will be a cutscene.
Speak with the Wandering Minstrel
Teleport to Camp Drybone in Eastern Thanalan, then go east to the quest icon on the map. Talk to the Wandering Minstrel to proceed.
Use the Spyglass
Check on the Vantage Point. (If you are having trouble finding it, hold the X key on the keyboard, or read How can I click on NPCs and summoning bells when lots of players are in the way? for more information.)
Look downward to see a small island in the water. Zoom in on the lower left part of the island, where there is a Strange Man. Move the crosshairs over the Strange Man. Follow the on-screen instructions to Execute Survey. There will be a cutscene.
Wait at the Designated Location
Go to the quest icon on the map and check on the sparkling Destination to proceed. (If you are having trouble finding it, see Use the Spyglass for advice.) There will be a cutscene. Afterward, talk to Clive to complete the quest.
Pain to Recall
Talk to Clive to begin the next quest. There will be a cutscene.
Speak with Clive at the Airship Landing
Talk to Clive. There will be a cutscene.
Speak with Clive and Have Him Accompany You
Talk to Clive, then go south up the stairs. Stand in the glowing circle at the top of the stairs and talk to Clive.
Accompany Clive to the Chocobokeep
Go northeast and through the exit of the building, then go northwest to the orange circle on the map. Stand in the glowing circle and talk to Clive.
Accompany Clive to the Aetheryte Plaza
Go north to the orange circle on the map. Stand in the glowing circle in the center of the orange circle on the map and talk to Clive.
Accompany Clive to the Adder's Nest
Go northwest to where the orange arrow is pointing in the minimap. Stand in the glowing circle and talk to Clive. There will be a cutscene.
Speak with the Serpent Scout at Nophica's Altar
Talk to the Serpent Scout. There will be a cutscene.
Speak with Clive Again
Talk to Clive to complete the quest. There will be a cutscene.
The Path Infernal
Talk to Clive to begin the next quest.
Speak with Clive Once More
Use the nearby Aethernet Shard to go to the Lancer's Guild, then go west to the quest icon on the map. Or, if you haven't attuned to the Lancer's Guild Aetheryte Shard, go north until you can go northeast across a small bridge, then go north from there until you can go east to the quest icon. There will be a glow around Clive, indicating a solo duty. Check on Clive and there will be a cutscene, and then the duty will ensue.
Solo Duty: The Path Infernal
First Phase
Use the Rising Flames duty action whenever it is available.
When the boss uses Vulcan Burst and the area is covered with an attack marker, wait for the countdown, then use the Dodge duty action. As long as you use the Dodge duty action before the on-screen timer runs out, it will work. Afterward, use the Precision Strike duty action.
When you and Clive are marked with circle attack markers that follow you, make sure not to overlap Clive with your circle, then wait for the on-screen countdown, then use Dodge before the countdown completes, followed by Precision Strike.
When the boss uses Spreading Fire, stay just outside of the initial circle attack marker, then when the circle marker under the boss disappears, run beneath the boss to avoid the subsequent attacks.
The boss will use Smoldering Claw, a large cone attack aimed at you or Clive. Stay away from the attack marker to avoid the attack.
Fireball places several circle attack markers in the area.
Crimson Rush is a large line attack that targets you or Clive.
Tail Strike hits the entire area behind the boss.
Pyrosault places a proximity attack marker in the area. Go far away from the attack marker to reduce the damage that you take.
Second Phase
When the boss casts Infernal Shroud, it gains the Infernal Shroud status, indicating the beginning of the second phase of battle.
Crimson Streak places a series of line attack markers on the area. Stand on the last line that appeared, and stay near the first line that appeared. When the first line disappears, run to the safe area where it was.
Fetters will immobilize Clive. Wait for the glowing "Defend Clive" to appear, then check on it. When the Active Time Maneuver begins, you can quickly type randomly on the keyboard or quickly press random buttons on the controller to fill the gauge.
The next time the boss casts Infernal Shroud, there will be another Active Time Maneuver. As before, quickly type randomly on the keyboard or quickly press random buttons on the controller to fill the gauge.
Several Infernal Swords will appear in the area. Destroy all of them while dodging the circle attack markers that appear in the area. Clive will use a move which reduces all the swords' health, making it easier to destroy them. Remember to use the Rising Flames duty action whenever it is available.
The boss uses a high damage attack after the swords are destroyed. Use damage-reducing moves if you have any available.
Third Phase
Fiery Rampage hits the area to the right of the boss, followed by the area to the left, followed by a large circle centered on the boss, ending with an attack that hits the entire area. After you dodge the first three parts of the attack, wait for the countdown at the end, then use Dodge before the countdown completes.
Subsequent attacks of Fiery Rampage will also include circle attack markers in random locations that you also have to avoid, in addition to the other parts of the attack.
When the battle is over, there will be a cutscene.
Speak with the Wandering Minstrel at the Burning Wall
Teleport to Camp Drybone at Eastern Thanalan and go east to the quest icon on the map. Talk to the Wandering Minstrel.
Speak with Clive Once More, Again
Talk to Clive and he will join you.
Follow Torgal's Lead
If you want to automatically follow Torgal, target Torgal and lock on (type /lockon or use the lock on keybind if you have it set) then use autorun. Otherwise, follow Torgal manually.
When Torgal stops, stand in the glowing circle and talk to Clive. There will be a cutscene.
Speak with the Wandering Minstrel
Talk to the Wandering Minstrel to complete the quest. Be sure to use the Metian Attire Coffer, the Torgal Whistle, and the Torgal Pup in your inventory to receive the Metian gear set, and to unlock the mount and minion.
How to Get the Triple Triad Card and Orchestrion Rolls
After you complete the quests, you can go to the Gold Saucer and talk to the Prize Claim who is southwest of the Gold Saucer Aetheryte Plaza, choose Prize Exchange VI, and purchase the orchestrion rolls from the event. You can also talk to the Triple Triad Trader who is southwest of the Gold Saucer Aetheryte Plaza to purchase the Triple Triad card from the event.