so when you get to sovngarde and confront Tsun one of your options for gaining entry is by right of birth/blood "I am dragonborn" and he replies "it has been too long his last I faced a doom driven hero of the dragonblood"

so I was wondering two things
1.what does that mean exactly doom driven hero
2.are all dragonborn doom driven

Doom is a word often associated with Lorkhan/Shor. In fact Lorkhan means doom-drum. Perhaps some good anecdotal evidence for the DB is a Shezzarine theory?

Under his name Doom Drum, more specifically. Likely a comparison between the beating of a drum and the beating of the Heart of Lorkhan.

Though it's a little odd the Tsun would call you that. Doom Drum seems to be a Merrish term for Lorkhan. Because, y'know, Doom.

Doom doesnt neccesarily have to have the negative connotation of destruction/ death that it has in modern times.
It can also just mean 'fate', so could say ".. a fate driven hero.." and the meaning would be the same.
It just wouldnt sound as cool.