A very simple weapon. I'm a really big fan of the hook+rope type weapons and I can't seem to stop making them. I like the idea of the red cracks against black metal as the fiends' sort of design, too, but I should make sure the future items won't all look the same.
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Butcher demons of the Black Rift use a variety of butcher tools including the prevalent meat hook, aptly named, "Meathook." Some are enchanted to impale creatures on their own, making them especially deadly weapons.
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Meathook
Weapon (sickle), rare
This sickle is attached to a 5-foot length of chain normally held in the other hand. While you wield this sickle with two hands, it gains the Two-handed and Reach properties.
Flesh Ripper. You have a +1 to attack and damage rolls made with this magic weapon. Immediately after you score a critical hit with this sickle against an organic target, the target takes 2d4 slashing damage.
Fiendish Hunt. You can snare distant creatures with this weapon. As an action, you can throw this sickle at a creature you can see within 20 feet of you and the chain magically extends to permit this length. Make a ranged attack roll against the target as normal. If you hit a target, you can choose to pull it up to 15 feet toward you if it is no more than one size larger than you. If this was a critical hit, you can also knock prone a target that you pull.