Once you’re level 36 (or above), head to the Raven Rock Temple and grab the Deathbrand Book here. At level 36, if the pirates guarding the ancient chest are killed, the helmet will spawn in the chest and the quest will start without the book being read. The dead Pirate Captain should also have the map to the other locations as well as the book. Locations of the armor pieces are as follows:

**** When the final piece of armor is found, the key to Gyldenhul Barrow will be in the last chest.

Gyldenhul Barrow¶

Just inside Gyldenhul Barrow lies a dead adventurer. A note on his corpse tells of his fate. Two sarcophagi containing Stalhrim are on either side of him, both of which can be mined. The sarcophagus on the left contains a draugr with some minor loot.

To proceed any further an Ancient Nordic Pickaxe is required to mine through the sarcophagus on the right to reveal a secret passage to a lower chamber. This area is a treasure trove, containing many piles of gold, assorted gems, potions, and weapons. As soon an item is picked up, the gate behind will close. Continue through the door ahead to find a large chamber and the resting place of Haknir Death-Brand.

Haknir Death-Brand¶

His skeletal remains can be found in the lower chamber. To the right of him, up the stairs, is a chest. Located directly behind him is a unique Scimitar named Bloodscythe.

When Bloodscythe is taken, the ghost of Haknir Death-Brand will appear and attack. During battle he will periodically disappear once he begins to take damage and summons several members of his crew, including Garuk Windrime and Thalin Ebonhand, to aid him. Upon his defeat another unique Scimitar named Soulrender can be looted from his ghostly remains.