Had a thought I'm surprised no-one has mentioned.

Spoiler: speculation on Durkon's motive
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This story is a weapon for Durkon.

It's true, but not the whole truth. Who would Durkon have told the truth to? His best friend, Roy. Roy, who has his own father issues.

At some point, The high priest of Hel will mention an aspect of this story to Roy, likely about how his dad died a hero or something. And That will be the proof Roy needs that it isn't Durkon.