The Fog Warriors are a group of freedom fighters native to the jungles of Seheron. They seek to make it independent from both Qunari and Imperium rule.  They arrive silently amid a deep and unnatural fog that is assumed to be magical, but some suspect it to be alchemy. They paint their armor and skin a pale white to blend into their surroundings. Each group of warriors has its own fog dancer who recites the legends of old.
“There are men who embrace destiny; these are the ones that change the world forever.” — Flemeth This article contains spoilers for Dragon Age II. Click here to reveal them.
Fenris spends several months with the warriors, after fleeing Danarius. There, he is educated on the Qun and feels a deep sense of camaraderie with those he meets there. He comments that the warriors bow to no one, living by their strength alone, an attribute he respected and admired. When the TevinterMagister returns for his Elven slave, he commands Fenris to slay the Fog Warriors, which he obliges. If Fenris is asked, if he could search for other Fog warriors, he replies he could but felt unworthy.
“Whatever we were before, we are now the Inquisition.” — The Inquisitor This article contains spoilers for Dragon Age: Inquisition. Click here to reveal them.
The Iron Bull recounts to the Inquisitor of a run-in he had with the Fog Warriors. In a Seheron market, the Fog Warriors ambushed his squad using an unnatural fog. He didn't see any mages, so he assumed it was alchemy. The Fog Warriors took down a few of his squad, but spared the civilians, showing that they have a code of honour.