Optional objective: Solve the riddle within the time limit - 5:00.
As you reach the island, four green circles will be marked on the map, within which you can find traces.
To find the mechanism parts, use Eagle Vision. They will be placed on trees and rocks which will be lit that way.
After examining the trace, you will have to match the symbol to the shining environment parts. Use analog sticks to turn and move the symbol so that the circles forming it are placed on the shining points.
Optional objective: Limit health loss - 30%.
Optional objective: Do not use any ranged weapons against animals.
Optional objective: Completed all the constraints in one playthrough.
Do so with all four symbols and a place which you have to visit will be marked on the map. There, you will be attacked by a groups of wolves. It's easiest to eliminate them using ranged weapons, but that way you will lose the chance to get full synchronization. If you want to defeat the best in close combat, you will have to press the buttons prompted on the screen. Unfortunately during this mission you will have to do it much faster than when fighting ordinary animals. It's rather hard and requires very fast fingers. If you fail to press a button, start quickly pressing the one which will appear afterwards. If you're fast enough, you will manage to free yourself before Connor loses more than 30% of his health.
NOTICE! If you kill the wolves with poison arrows while on a tree, you will still be able to complete the optional objective. This might be a bug which can be fixed in future updates.
With the last animal dead, examine the marked spot and use the pistol to blow up the barrel by the rock. That way you will unlock a cave entrance.
After getting inside, swim forward until you reach a rock which you can climb. Move along the wall and you will reach the artifact you're looking for.
Pick it up and quickly run forward with the free run button pressed. You have a limited amount of time to escape the collapsing cave.
The mission will end as you get outside. You will also obtain captain Kidd's outfit which you can put on in the basement of Davenport's manor.