Treasures of the Main Quest Part 4: A Pleasant Walk With Sisipu
This is the most challenging portion of the FFXIV main scenario quest Treasures of the Main - and the only portion that involves actual combat.
Sisipu is waiting at the Zephyr Gate. This is the exit from Limsa Lominsa you used earlier to get to Camp Bearded Rock.
At the natural archway that marks the gate, a window will pop up, asking if you wish to proceed with the quest. A cut scene plays, then the quest starts. This will effectively start an escort quest where a moving instance surrounds the adventurer and Sisipu. Stay near her, and kill any Ankle Biters (giant mosquitos) that venture near. There will be four total.
The Ankle Biters only have 3 points of health, which means they can be killed by Disciples of the Land and Disciples of the Hand who are only armed with rocks. However, they can still evade and an attack can miss, so they can do some significant damage. For the non-combat classes, it's a good idea to sit down and recover health after each combat if damage has been taken.
Sisipu runs very quickly, but if she outruns the adventurer (and she will, constantly) she will either stop and wait, or run back to where the adventurer is standing. Just stick with her, since she leads the way to the light house that is this leg's ultimate destination.
This portion of the quest has some definite quirks. Leaving the instance will cause the quest to fail and have to be restarted. Sometimes the movement of the instance lags, however. So keep an eye on the mini map, and if you reach the edge of the instanced area, just stay there until it moves forward.
When Sisipu pauses and says, "Now let us locate the watch," that's the cue to walk forward, toward the lighthouse. A cut scene begins.
After the cut scene, "talk to" the nearby "Wind-worn corpse" (it shows up on the mini map as a friendly NPC) to start the next cut scene.
Next, walk up to the lighthouse stairs next to Sisipu to start the final cut scene for this part.