Under Her Skin

Under Her Skin is an advisor quest for Leliana in Dragon Age: Inquisition. It is only available if the Inquisitor chooses to side with the templars instead of the mages.

"Much like the Inquisition, Corypheus has invested great time and effort building a trusted inner circle. Calpernia leads the Venatori - and it seems she's been busy. In the search for a a particular set of elven ruins, she and her army of Tevinter extremeists have taken a keen interest in a merchant named Vicinius. Perhaps finding him would shed more light on Calpernia and her motivations."

Acquisition
Available after talking to Leliana in Skyhold. This quest should be completed before taking on What Pride Had Wrought, since it is, plot-wise, a prerequisite for dealing with Calpernia.

Walkthrough
Travel to Val Royeaux and find Vivinius' house. Find papers in the first room and deal with Venatori upstairs. Search the small room to find three crystal pieces; you can also find Vivinius' body in his study upstairs.

Show the memory crystal to Leliana back in Skyhold, then go to the Undercroft and speak with Dagna. Head to the War Room and pay 1 power to complete a newly available operation "Plant Crystal in Venatori Headquarters". Head back to Leliana and listen to the receiving crystal with her. Then, once again return to the War Room and pay another 1 power to complete "Investigate the Shrine of Dumat" operation.

Use the world map to travel to the Shrine of Dumat. Inside you will have to fight some shades, wraiths and demonss. There are six red glowing crystals scattered across the area. Those contain Corypheus' memories. Collect all six to complete optional objective. In the end, you'll find magister Erasthenes locked behind some sort of magical barrier. Talk to him to learn more about Corypheus and Calpernia and then decide his fate.

Back in Skyhold tell Leliana about the magister to finish the quest.

Rewards

 * 400 Influence
 * 3 Power