Necklace of StrangulationEquipment 15
Source Pathfinder Gamemastery Guide
Weight light
This beautiful necklace appears to be a magical item such as a necklace of fireballs or a pendant of the occult. When invested, it magically locks in place, suspiciously tightly, and fuses to you. When you enter a situation of extreme stress (as determined by the GM), the necklace tightens around your neck, suffocating you and dealing 30 bludgeoning damage to you at the end of each of your turns. Once per round, you can spend a single action to attempt a DC 34 athletics check or DC 34 fortitude save; success means you don't take the damage on your current turn, but you continue suffocating. The necklace loosens after you've been dead for a month.
Traits
This rarity indicates that a rules element is very difficult to find in the game world. A rare feat, spell, item or the like is available to players only if the GM decides to include it in the game, typically through discovery during play. Creatures with this trait are rare. They typically can't be summoned. The DC of Recall Knowledge checks related to these creatures is increased by 5.
CursedAn item with this trait is cursed to cause trouble for its owner. A curse isn't detected when the item is identified, though a critical success reveals both the presence and exact nature of the curse. Cursed items can't be discarded once they've been triggered or invested the first time. The item can be removed only if the curse is removed.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
TransmutationEffects and magic items with this trait are associated with the transmutation school of magic, typically changing something's form.