Originally Posted by
Golden Yak
That's the thing, Darion was completely against it, he almost rebelled against the Ebon Blade, the Lich King, everything. He believed that Fordring deserved to rest in peace and should not be raised to become undead. Finally he decided to go along with the strike force because he ultimately would not abandon his comrades even if he was against what they were trying to accomplish, even if he believed they were to be damned beyond all forgiveness.
And when it all went fruit-shaped he sacrificed himself to save every death knight and get them back to Acherus in one piece. It was this devotion and sacrifice that made the Lich King choose him as a the leader of the Four Horsemen in the end. Darion now believes it is his destiny to stand by the lost and the damned and fight for them, come what may.