I’m supposed to help the kodan destroy Romke’s horn, but when the horn gets 3/4 of its life gone nothing else happens. No more mobs come and the horn does not take any more damage. I tried walking all around trying to trigger something different. I tried exiting the game and trying it over to no avail. I even tried shooting it on autoattack for five many, many minutes! Any help is appreciated. Sorry if this has been posted before. I couldn’t find anything about it. Thanks! 
"Preserving the Balance" bug
I’m having the same problem, and it’s super frustrating to have something this small be blocking my progress. Help?
Edit: I found the problem. There were some hidden mobs near Eir, almost completely off the map, that got summoned as well. I don’t know how or why they were no where near the horn, but after I killed them, it worked again.
(edited by thelastangstbender.9043)