Crafted in imitation of one of the chains that bind Tharizdun, each link is carved with runes, each one listing horrible acts of murder and torture the Chained God would inflict on the gods that bound him and their followers. This chain is unbreakable except for wish spells and divine intervention. Wearing the chain bestows powers to the attuned.

Demonic Resilience.

• Fiends and celestials have difficulty harming you. If a fiend or celestial targets you directly with an attack or a harmful spell, that creature must make a Wisdom saving throw against  DC 17 (a fiend or celestial needn’t make the save when it includes you in an area effect, such as the explosion of fireball). On a failed save, the creature must choose a new target or forfeit targeting someone instead of you, potentially wasting the attack or spell. On a successful save, the creature is immune to this effect for 24 hours.
• You can’t be targeted by divination magic or perceived through magical scrying sensors. 
• You have advantage on Intimidation Checks.
• You have resistance to necrotic damage.
• You are immune to the frightened condition.

Demonic Strength.

• Your Strength score changes to 25.  The item has no effect on you if your Strength without the chain is equal to or greater than 25.

• You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.

If you aren't wearing the chain, you can use a bonus action to call it to you. It always comes to you, even if it is on another plane. If a creature touches the chain and is not attuned to it or immune to necrotic damage, they have vulnerability to necrotic damage for as long as they are touching the chain.

Curse. If you go 7 days without touching the chain, you go violently insane, and have vulnerability to bludgeoning, piercing, and slashing damage. Leading up to the 7th day, you become more erratic and paranoid. Touching the chain removes the insanity and vulnerability.

Notes: Advantage: Intimidation, Resistance: Necrotic, Immunity: Frightened, Set: Strength Score, creature of evil alignment, Cursed, Wristwear