One warning, if you "Speak to Ecclesiast Aban Fal @ 1890 x 690 (big purple dude) and show him the Ancient Device", make sure you allready got the insignias with you.
I did the mistake to talk to him and to farm insignias after this talk, i wasn't able to reopen the chat with him to show him the insignias. A called ARK only told me i do someting wrong here. Well since we all know that ARKs know lesser than us all sometimes i decided to delete mission and to restart with full bag of insignias this time.
Mission done now and hope no one else will have same problems like me.