Among the many side missions you can complete in Assassin's Creed Black Flag Resynced, one type is known as Templar Hunts. These are multi-part mission chains in which you'll help an Assassin eliminate a prominent Templar and collect the keys needed to unlock the armor behind the gate in the Great Inagua manor.
Unless otherwise stated, all these missions will be available no later than Sequence 6 of the story.
You'll find Rhona in Havana, in the south-southeastern part of Dry Tortuga (216,569).
Look for her in the south-southeastern part of the city, near the harbor on the southern shore.
Talk to her to begin her missions.
The mission will begin as soon as you talk to her. You'll need to eliminate several waves of enemies.
The second mission will become available in the western part of Havana after completing the previous one (208,584).
Head to the market and look for the green markers to speak to two NPCs. Then find a bench to sit on or any other spot where the "Blend" prompt appears and wait. After a while, chase down, kill and loot the thief to complete the mission.
Rhona's third mission can be found in the southern part of Havana and becomes available after completing the previous one. It starts in the same place as Rhona's first mission (216,569).
You'll be sent to three locations, each containing a gunpowder barrel. They're all in areas occupied by enemies, so it's up to you whether you charge in or take them out one by one. You need to destroy all three barrels, either by shooting them or approaching and interacting with them to light the fuse.
Rhona's final mission becomes available after completing the previous one. You'll need to meet her in central Havana (216,578).
This is a very straightforward mission. Run after Rhona as she heads toward the harbor. If you keep up with Rhona, Flint will eventually stop next to an explosive barrel. Shoot it, confirm the kill and collect his key. You'll then need to meet Rhona again to complete her mission chain.
You'll find an Assassin in Nassau, the city in the southwestern part of Eleuthera.
Look for the Assassin in the southeastern part of the city and talk to him to begin the first mission in Upton Travers' chain.
Once inside the search area, use Eagle Vision to locate a green marker and use the Look button to tag it. This will allow you to identify Travers' men, whom you'll need to follow without being detected.
They'll eventually lead you to Upton Travers. You can shoot him from a rooftop and then approach him to... confirm the kill. More or less.
The second mission in this chain begins in the eastern part of Nassau (603,758), quite close to where the first one ends.
You'll need to follow Travers, hide, wait for his brother to arrive and use the "Eavesdrop" prompt. Afterwards, follow Travers and eliminate the targets before searching the house. You're looking for a lit table on one side of the house, where you'll find a note you need to read. You'll then receive a new marker where you must eavesdrop on the meeting. Finally, return to Upton, protect him and complete the mission.
After completing the second mission, look for Travers in the northern part of Nassau (595,762) to begin the third.
After the conversation, you'll need to eliminate a group of enemies. Then follow Travers for a while, help him keep moving and take out a couple more enemies.
Upton Travers' fourth and final mission becomes available after completing the previous one. Look for Upton in the northwestern part of Nassau (588,761).
If you follow the tree branches from the cliff where Upton is standing, you can reach the branches above the camp where Vance can be found. Wait for him to walk underneath and take him out with an air assassination or by hanging him. After the cutscene, chase the target and eliminate her. Return to Upton to complete the mission and obtain the third key.
You'll find Opía in the northern part of Cayman Sound, in the southeastern corner of the Castillo de Jagua region (304,311). She's standing on a beach, looking out to sea.
Talk to her to begin her Templar Hunt missions.
Follow Opía and use Eagle Vision to locate the white jaguar's trail. After finding the marks on the ground and wall, talk to Opía and follow her. It won't take long to track down and kill the jaguar. This time, completing the mission will earn you an additional reward: the Rabbit's Foot trinket.
Opía Apito's second mission begins southeast of the previous mission, on the Grand Cayman dock, southwest of Cruz. Talk to her to begin the mission.
Head to the marker and hide in the tall grass to eavesdrop on the two people talking. Then go to the search area and use Eagle Vision and the Look function to find the King of Fishermen. Follow him for a while until the "Pickpocket" option appears when you approach him. The mission will end once you steal the Bill of Sale.
This mission begins automatically after completing the previous one. Opía's marker will appear in the western part of Grand Cayman, the settlement where you began the previous mission, in the southwestern part of Cruz. After speaking to Opía, follow her and hide in the leaf pile beside the entrance when she stops in front of a door. You'll then have to chase a man along the dock until a cutscene plays, before pursuing him aboard the Jackdaw.
You'll need to damage his ship so you can board it. You can take him down as soon as you jump aboard—you won't kill him. A cutscene will play and the mission will end.
The next mission marker will appear on Pinos Isle, in the center of Castillo de Jagua.
Approach Opía and interact with the prompt to begin the mission. She'll show you which route to take and which enemies to eliminate while remaining undetected. Eventually, you'll need to allow yourself to be spotted and eliminate a couple of waves of enemies. After reviving Opía if she's taken down, you'll need to find Lucia. Use Eagle Vision and the Look function—she should be east of your position.
She'll flee when you approach, so chase her down and eliminate her to complete this mission chain.
The fourth and final Assassin you need to help is Antó. He can be found in the southeastern part of Kingston, in the Navassa region (618,161).
The mission begins as soon as you talk to Antó. Head to the marker and examine the table beside the guards while you wait, then go to the marker at the church. You'll need to chase and tackle one of the guards to trigger a cutscene and complete the mission.
This mission becomes available after completing the previous one. Head to the area southwest of central Kingston to find Antó again.
You'll need to free the Maroons at three locations. Once you've done so, Antó will give you the location of the officer you need to eliminate. Afterwards, return to the Assassin to finish this part of his mission chain.
Antó's third mission begins in the southeastern part of Kingston. Talk to him after completing the previous mission to begin it.
After speaking to him, you'll need to defend yourself against several enemies.
Antó's final mission becomes available after completing Under Attack, and you'll need to meet him in central Kingston to begin it. Eliminate the officer, loot his body and follow Antó. All that's left is to find Kenneth at the party and eliminate him. Finally, leave the area and talk to the Assassin to complete Antó's mission chain.
Once you've collected the keys, you'll need to use them on the gate in the main hall of the Great Inagua manor. This is the main objective of the Damn Fine Gear side mission, which becomes available as part of the story. Your rewards will be the Templar Armor and the Templar Cross trinket.
Bear in mind that the armor is purely cosmetic and offers no special advantages or anything of the sort.
