Meaning of the title Dies Irae is Latin for “Day of Wrath”, a term often associated with judgment and death.

What actually happens in the climax?
In the final moments, the film reveals that the external threat the protagonist has been fighting is not entirely real. Most of the danger, violence, and paranoia come from his fractured mind, shaped by guilt, suppressed trauma, and moral conflict.
The climax confirms that
The events are partly real and partly psychological
The protagonist has been punishing himself mentally
What looks like fate or a curse is actually his own conscience turning against him
Worth a Look
The ending suggests:
You cannot escape consequences, even if you hide them
Suppressed guilt will manifest as fear, hallucination, or self-destruction
Justice doesn’t always come from the outside — sometimes the mind becomes the executioner
The film intentionally avoids a clean resolution, showing that inner demons don’t disappear instantly.