Dragonborn must defeat the Ebony Warrior who seeks a worthy challenge and wished to finally go to Sovngarde. If the Dragonborn travels to Last Vigil and meets the Ebony Warrior, he will be standing there waiting to fight. Combat is initiated after making the first strike. The quest completes when the Ebony Warrior is killed. Upon death, he will say, "At last, Sovngarde..."
The Ebony Warrior will not go down easily. His ebony armor provides a huge defensive boost and his ebony sword absorbs health, he can use Unrelenting Force, Restoration spells to recover health, casts Frost Cloak and Ebonyflesh to reduce physical damage and prevent close combat without risking losing stamina, and his ebony bow is enchanted to induce paralysis for several seconds. Suggested to use repeating fire or explosive attacks to take his health down exponentially.