Board Thread:Skyrim/@comment-139.195.225.109-20140128135851/@comment-74.34.110.248-20140512010451

I had the same problem with Miraak being stuck in ethereal mode after defeating him the first time on the PC version of the game. The console command ~resethealth did not work for me, but I figured out a way to finish the quest even though it took several tries. What worked for me was to just lower Miraak's health down to half then, run away from him. He will still attack and regen health, but will soon turn ethereal and a dragon will land. Kill the dragon and run far away from it. Miraak will absorb the dragon's soul and if he is at about 60% health, he should be back at about 95% health. At this point, he will become attackable again and start attacking immediately. Save your game at this point, and repeat the step explained above. I hope this helps.