Emerald Fulcrum LensEquipment 10
Source Pathfinder #165: Eyes of Empty Death
Price 1,000 gp
Weight 3 bulk
This concave green lens is pitted and flawed; its jagged edges can cut those who don't handle it with care. While you have the Emerald Fulcrum Lens invested, your flesh appears waxen and pallid. You gain negative healing and Harm spells gain a +4 status bonus to the Hit Points they restore to you. You can also activate the lens in the following ways.
Activate 
Interact (healing)
Frequency once per day
Effect You grasp the Emerald Fulcrum Lens in one hand, regain 30 Hit Points, and gain a +2 item bonus to saving throws against magic for 1 round.
Effect: Emerald Fulcrum Lens (Saving Throw)
Activate Interact (attack, possession)
While grasping the lens, make a melee spell attack roll with a modifier of +20. On a hit, you force the splinter of Nhimbaloth's essence from the lens to possess the target. You're no longer invested in the lens, and the target gains the benefits as though it had invested the lens but can't activate the lens's other abilities. This effect is permanent, but it can be ended by any effect that removes a possession effect. The lens doesn't have any magical abilities until the possession effect ends; when it does, the essence returns to the lens.
Traits
A rules element with this trait is one-of-a-kind. The DC of Recall Knowledge checks related to creatures with this trait is increased by 10.
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).
NecromancyEffects and magic items with this trait are associated with the necromancy school of magic, typically involving forces of life and death.
NegativeEffects with this trait heal undead creatures with negative energy, deal negative damage to living creatures, or manipulate negative energy.
OccultThis magic comes from the occult tradition, calling upon bizarre and ephemeral mysteries. Anything with this trait is magical.