Hreidmar's Cursed Armor can be found in the Hodda Shelter in Vangrinn. This armor is cursed and will slowly kill you if you use it. First, you must complete the five Jotun Blight artifacts located in Svartalfheim to unlock five clarity runes. Then, socket a clarity rune to each piece of the cursed armor to negate the cursed effect and equip the full armor set.
Timestamps
00:00 - Intro
00:59 - Jotun Blight 1/5 (Gullnamar)
02:27 - Jotun Blight 2/5 (Svaladal 1)
04:07 - Jotun Blight 3/5 (Svaladal 2)
06:28 - Jotun Blight 4/5 (Svaladal 3)
07:50 - Jotun Blight 5/5 (Vangrinn)
09:29 - Purifying Hreidmar's Cursed Armor