It is funny, I am literally writing a chapter about this very subject when this post popped up.
The Crusade was a horror show, Cannibalism, fanatics setting themselves on fire, massacre and carnage. And very few made it through all of this with any semblance of themselves intact.
Darien is going to be tested, as he rises to a Crusader Lord, and the person who holds his soul, Wylan, isn't about to allow him to get swallowed by it. Darien may be the Warlord of the Silver Boar, Amir of the Judean plateau... but Wylan is the one who fights to keep him human. Trust our little Blind Squire, he's got work to do.