Helm of the Fiend
A helmet shaped like a demon's head
Medium Armor Set: Fiend Armor Dyeable ID: 869
Follower Damage +4%, Concussive Damage +5%
A cult of maniacs crafted this strange set of armor. A forbidden sect of deranged souls that insanely believed they could become that which they worshipped, a demon of the abyss - if only they dressed as one first (and sacrificed as many souls as possible).
About Helm of the Fiend
Helm of the Fiend is a Medium armor piece in Conan Exiles. It provides 34 armor, with 1 heat resistance and 1 cold resistance. It belongs to the Fiend Armor set.
Medium armor is the middle ground: enough mitigation to survive mistakes while keeping reasonable stamina for dodging, which fits most Strength and Agility builds.
Its set or piece bonus reads: "Follower Damage +4%, Concussive Damage +5%".
On the details, it weighs 7.88, has 290 durability, and can be dyed to match your character.
Within the Fiend Armor set its 34 armor value ranks #3 of 5 pieces.
Verdict: Overall Helm of the Fiend is a Medium piece best used as part of the Fiend Armor set, which rewards a balanced playstyle.