Fionn Vestige Part A
Location: Ridge of Frozen Souls – Ridge of Frozen Souls Entrance
From the mistle, follow the path forward along the snowy trail up the side of a mountain. When you reach the truck sticking out of the ground (first picture above), the vestige will be located in the pit to the left of the vehicle. To reach it, you will need to carefully jump from platform to platform. It will be on the last platform before you reach the ground.
Fionn Vestige Part B
Location: Ridge of Frozen Souls – Iceless Falls
From the Iceless Falls mistle, facing the direction of the waterfall, head straight past the waterfall on the left side following the stream. When you reach the fork at the end, take the left path to come to a snowy cliff where this vestige can be found. Stick to the right side of the path near the vestige so you don’t fall through the thin ice on the left side (slightly discolored patch of snow). When you get close to the vestige, two enemies will climb up over the edge of the cliff and attack.
Fionn Vestige Part C
Location: Ridge of Frozen Souls – Iceless Falls
From the mistle, looking at the waterfall, take a left onto a path leading down. When the path forks near a dead lost, take a left, exiting the tunnel, to come to a snowy cliff. The vestige will be at the end of a cliff guarded by some enemies. It will be to the left of a rotten mistle.
Fionn Vestige Part D
Location: Ridge of Frozen Souls – Snowfield Summit
From the mistle, head north into the snowfields towards the ruined buildings off in the distance. Along the way, you will come across two gorges splitting the area into three paths. Make sure you are on the middle path. When you reach the ruined buildings, look to the left to find this vestige part in the corner of a building’s remains. Be wary of the enemy here as he is a tough one with good attack and HP. It might not hurt to try and have this guy kill himself by going over the ledge.