Need to kill Bloodwing. Im level 40. Done Raithwall, killed cactus flower and Nidhogg.Can't get key.?

Dantro's wife says she doesn't know where he is. I have the cactus flower. I can't give it to her. She says Dantro went to the North or something across the river. Villager's say that the ferry has not come back. I never did the Dalmascan Patient side quest. Both entranced back into the page are blocked off. What do I do? I think I have to talk to Dantro again but how do I find him if he has gone across the river and I never talked to him again after completing the quests to start the side quest?