This paper model is Bloodskal Blade, a unique two-handed weapon found in the game The Elder Scrolls V: Dragonborn, the paper model is created by ZombieGrimm. The finished model measures about 48 inches long.
During the quest The Final Descent, travel into the depths of Bloodskal Barrow. There, the Bloodskal Blade lays next to the remains of Gratian Caerellius. The blade can be upgraded with a silver ingot and the Arcane Blacksmith perk. However it does not benefit from any smithing perks. This means that the weapon cannot be improved past flawless quality without boosting the smithing skill over 100. This can be achieved by using enchanted items and/or blacksmithing potions to fortify smithing. [Source: wikia]
You can download the papercraft model here: The Elder Scrolls V: Dragonborn - Bloodskal Blade Free Papercraft Download