Twining ChainsEquipment 1
Price 5 gp
Weight 1 bulk
This set of chains is completely covered with spikes and sharp blades. Not balanced for weapon use, twining chains are instead wrapped around a user's body as a deterrent to attackers-and, for some, a fashion statement. While wearing twining chains, you gain the Thorns reaction. In addition to their dangers, twining chains' weight also increases your armor's Bulk by 1, Strength entry value by 2, and check penalty by 2.
Thorns 
Trigger You are hit by an unarmed attack
Effect You twist to harm your attacker with your chains' spikes and blades. Make an attack roll against the triggering attacker using your unarmed attack modifier. On a hit, the attacking creature takes 1d6 piercing damage. This damage increases to 2d6 piercing damage if the armor has a +1 potency rune, 3d6 piercing damage if the armor has a +2 potency rune, or 4d6 piercing damage if the armor has a +3 potency rune. However, whether you hit or miss, you take piercing damage equal to the number of d6s of piercing damage you would deal your attacker.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
AdjustmentItems with this trait are intended to alter existing pieces of equipment, typically armors, shields, and weapons. The given item will note which type of equipment it modifies. A piece of equipment can only be affected by a single adjustment at a time. Unless otherwise noted, adding or removing an adjustment requires using a 10-minute activity and a repair kit.