Collect 6 stolen totems. They resemble staves with crystals on top. They can be found around the battle and the erudite-controlled section of Stonestair Byway, but their specific /loc seems to be randomized. Don't forget to check inside buildings for them. I found the last 2 inside erudite "houses".
Speak with Lieutenant Vesder in North Freeport just outside Stonestair Byway ( -12, -18, -324 ) /waypoint -12, -18, -324 and show him the stolen totems.