Investigate Therinfall Redoubt is a war table mission in Dragon Age: Inquisition.
Acquisition
Complete the quest In Hushed Whispers and then talk to Krem.
Operation Text
Results
...
—Thanks to the distraction provided by the Inquisition scouts, the Chargers were able to get into Therinfall Redoubt. It's largely deserted, but there are clear signs that the Templars joined a much greater force. We found a refined form of lyrium and a large number of Templar corpses. Judging by their wounds, they were executed after falling ill.We also found signs of demonic activity, although there were no rifts present. This place was home to something powerful and malevolent, and judging from the signs of violence at the Redoubt, it fled when the main force of Templars left.
Lieutenant Cremisius Aclassi
Cullen
Rewards
Leliana: 20 Influence, 3 Red Lyrium
Cullen: