On my first attempt, Tonn stucked in front of tower 3 - he was supposed to blow it, but he didn't do anything. Then I restarted cleaning up all the mobs and it solved this part.My current is after destroying tower 3 and cleaning up the beach. The next step is "Speak with Tonn" but he don't quest-respond. It's only availble the 'greet' option. Edit: I just tried with my other character and I had the same bug. I just can not talk to Tonn, the quest speech is disabled. I'm giving up for now, so I'm going to level up to 80 on open world.