What role does Friar Lawrence play in the last scene?

In the last scene, Friar Lawrence serves as a confidant to Juliet, helping her come up with a plan to avoid an unwanted marriage to Paris. He provides her with a potion to make her appear dead and offers support in executing the plan. Ultimately, he plays a crucial role in the tragic outcome of the play by being involved in the miscommunication that leads to the deaths of Romeo and Juliet.