There are a plethora of optional bosses in Dragon Age: The Veilguard, but the series that you’ll encounter in the “Heart of Corruption” questline, including the Fall of the Protector, are really worth your time. Fall of the Protector specifically comes up in the “Gate of Pale Reflections” quest step that you’ll get in the Crossroads, but it’s all part of the “Heart of Corruption” quest. You’ll need to do a few things to reach the boss, but once you do, you’ll have your work cut out for you.