Latenna Questline

Quest Step	Location (Click for Map Link)
First, you need to obtain the Haligtree Secret Medallion (Right). To get this item you need to enter the Village of the Albinaurics, head around and up until you encounter a Perfumer, there will be a bridge to the left, do not cross the bridge, instead go past where the Perfumer was and you should see a pot on your right, hit the pot to reveal Albus, speak with him and he will give you the item.
With the item you need to find Latenna, to get to her you need to go through the Lakeside Crystal Cave, once you defeat the boss you can progress through the back of the cave and make your way to Slumbering Wolf Shack. Speak with Latenna here and she will ask that you take her to Haligtree, she will then give you a Spirit Ash of herself
To continue her quest you need to find the second half of the medallion, this piece can be found in Castle Sol behind the Commander Niall boss fight
With both halves, you can now use the medallion at the Grand Lift of Rold to access the rest of the Consecrated Snowfields
To finish Latenna’s quest you need to head to the Apostle Derelict, here you will be able to summon Lattena, doing so will complete her quest and reward you with a Somber Ancient Dragon Smithing Stone