The Lone Warden

The Lone Warden is a companion quest for Blackwall in Dragon Age: Inquisition.

"One of Leliana's agents reported a man, calling himself Blackwall, dressed in full Grey Warden regalia and last seen travelling through the Fereldan Hinterlands. With so many Wardens disappearing in the wake of the Divine's death, this Blackwall should be questioned."

Acquisition
Automatically triggered after the main quest The Threat Remains.

Walkthrough
Travel to Hinterlands, where you can find Blackwall southwest from the Upper Lake camp. He is on the opposite (west) side of the lake so you'll need to go around it. You will find him rallying a couple of conscripts to fight off the bandits, who will attack shortly afterwards. When talking to him after the fight, he decides to join the Inquisition.

Results
Blackwall joins the Inquisition. New mission at the War Table (needs specifying).