"Yes. The demons never got near me. How do you face those things?"
"Because I do it for you. They terrify me."
- Drian and Nikola(src)
Drian was a soldier stationed at Bastion's Keep. He was married to Nikola.
When Azmodan besieged the fortress, Drian urged Nikola to flee south, but upon his confirmation that he wouldn't flee with her, she refused to flee. She told him to put a sword in her hand, and she'd fight alongside him.[1]
During the siege, demons invaded the keep's main stronghold, but they were defeated by The Nephalem. Afterwards, Nikola asked Drian how he was able to face the demons. He said that he did it for her.[2]
Eventually, the demons were driven from the keep, though the fighting continued outside. Nikola stated that when the siege was over, they should have children. Drian stated "that sounds wonderful. I think I’m needed back on the wall."[3]
When The Nephalem departed the keep to confront Azmodan, Drian complained how he wasn't able to be there. Nikola said "good. You could use some sleep." Drian responded that he wasn't tired, before catching on.[4]
Drian was apparently killed by Adria after she revealed her true allegiance to Diablo, turning on the Keep's defenders.[5]