I just did the Dawn Breaker dungeon in Follower Dungeon mode. It is one of the most fascinating dungeons I’ve ever done and lots of fun. However I got stuck near the end. If managed to get back on track but I’m not sure how I did it.
I got to the final boss Rasha’nan and started fighting. At one point the boss flew off and the general said to follow. I tried but lost Rasha’nan.
The yellow direction arrow was pointing back at the Dawnbreaker. I flew off. A small boat was going along beside us shooting a yellow beam at me. I’m not sure what that was. I thought I saw an instruction to follow the skiff.
I died a few times. Finally Rasha’nan returned and I fought again but the boss flew off again. This time I saw yellow balls so I thought I’d fly through them. Then I loss the boss again. I flew back to the ship, the boss was there, I fought the boss and we won.
So I did it, got the achievement but it took about an hour of flying around. I have the quest to do the dungeon again on my top alt but exactly what are you suppose to do with Rasha’nan the final boss?