The Ebony Warrior

The Ebony Warrior is a quest available after reaching level 80 with  installed.

Background
The Ebony Warrior is an experienced Redguard warrior who approaches the Dragonborn when they reach level 80 and explains how he has defeated all types of foes and enemies, and his last objective is to be sent to Sovngarde by a worthy adversary.

Walkthrough
Upon reaching level 80, the Ebony Warrior will usually seek out the Dragonborn at the first Hold entered. However, if that does not occur, possible locations for the Ebony Warrior on the holds are: He will then approach the Dragonborn and issue a challenge. He requests them to meet him at the Last Vigil, a campsite located high in the Velothi Mountains.
 * Whiterun, by the Hold gates
 * Riften, outside The Scorched Hammer, by the forge
 * Markarth, outside The Warrens
 * Windhelm, behind Candlehearth Hall
 * Falkreath, by the Hold entrance
 * Solitude, by the Hall of the Dead

Travel to Last Vigil and meet the Ebony Warrior. He will be standing there waiting to fight. Combat is initiated after making the first strike. The quest completes when he is killed.

Bugs

 * If using Dragon Aspect, when the Ancient Dragonborn is summoned (the Dragonborn reaches half health), the Ebony Warrior may regain all health and ignore the Dragonborn until attacked again.
 * The Ebony Warrior may not always appear in the first nor the first few Holds entered at level 80. Simply travelling to all the Hold capitals will usually fix this bug.

Der Ebenerzkrieger El guerrero de ébano Эбонитовый Воин (Квест)