If I recall correctly the last quest of that questline should be Maligath's Malice.I think this is referring to the quest line that has me stumped...
I finished the quests with Denwal the Mad where he sends you into the southern tunnels of Dunskeig to kill the obelisks, dragon cultists (elm and oak). After finishing all of that Denwal says he’s not sure what’s next. Is this the end, for now, or did I make an error somewhere? I have checked OW and can’t seem to find anywhere to pick it back up to continue the story line. I have no new question marks or new exclamation marks anywhere.
Thanks.
There may however be additional quests in the sewers (Smugglers) depending on how far through you are.
Hope that helps.