The Dacian mission "Throw the Celts out" does nothing besides giving claims. It's supposed to change the culture in every single one of your provinces but it does not do that, nor does it change your religion.

The "Unite Getodacian Culture" is also bugged, as you cannot complete it under any circumstance. The mission requires either the main culture to be Getean and have Dacian culture accepted or vice-versa. There is no Dacian culture in the game however, so this mission can never be completed.

Please fix, Dacia campaigns suffer too much because of these 2 missions