In this situation, it is no longer about luck, because if Dortmund should rely on luck to defeat Real Madrid then they have already lost, but of they are qualified for the title it is just for them to decide who is going to win the title. Madrid's performance is top-notch, and to me with the strategy and the training Madrid will want to win the Champions League. exactly they are not easy to beat and even if Dortmund should score first it does not change the fact that Madrid can still change the game in their favor, and when they start playing there will be much pressure on the players. and if its actually the experience Madrid has a better experience of the champions league than Dortmund and that is the reasons that can make Madrid change the atmosphere of the game.
Whatever the result, in the final each team will do everything they can to win. Luck, mental issues and players balance all have an important role in this match. Dotmund and Madrid still have time to prepare. So if we talk about mentality and luck, both have that, but the final result is what is very difficult to predict. if both of them appear aggressive and don't make many mistakes then a penalty shootout still makes sense. We can no longer judge Dortmund from the Bundesliga match, there they performed badly but in the UCL Final I don't think they will concede easily.