So if you don't know, the The Banished Executioner is a boss right before the final one, The King. But before you enter the room with the boss there is a side path. You will see what looks like parkour to get to a chest. It is really hard but the chest contains a ring known as the Crimson Berserker Ring. That ring allows you to have more power the more mobs you kill without taking ANY damage. It is probably one of the most powerful rings, maybe even THE most powerful ring in Archvale. The parkour is really hard as it required you to to 4 diagonal dashes & 7 regular dashes. To do this what worked best for me is to set your dash key bind to left click then use my other hand to do WASD & complete it. Even then it will still not be easy, but it should be a lot easier using that method. But the most important step to beating it is just practice. It took me about 20 minutes to do just doing it nonstop. Then when you actually complete it you will feel very good! This probably the easiest way to do it in my opinion.