Dawnguard Rune Axe

{{item infobox
 * image = DawnguardRuneAxe.png
 * type = War axe
 * slot = Hand
 * damage = 11
 * armor =
 * weight = 13
 * value = 175
 * ingredients =
 * upgrade = Steel Ingot
 * descr = Enchantment does additional sun damage based on the number of undead killed but will reset every dawn.

Found
}}
 * Random location specified during the quest
 * id = 01668c

Tempering
If you temper the Dawnguard Rune Axe, it will not reset the count of undead killed every dawn and will just increase allowing it to eventually one-shot Dragon Priests and Draugr Death Overlords

Quest

 * Lost Relic

Dämmerwachtrunenaxt